Achieve Life Sciences, Inc. Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Common Stock - Issued and Outstanding Shares - Additional Information (Detail)

Common Stock - Issued and Outstanding Shares - Additional Information (Detail) - USD ($)													12 Months Ended			40 Months Ended
	Dec. 07, 2020	Aug. 03, 2020	Jul. 02, 2020	Apr. 28, 2020	Mar. 12, 2020	Dec. 31, 2019	Dec. 17, 2019	Oct. 03, 2018	Jun. 19, 2018	Jun. 15, 2018	May 22, 2018	Sep. 14, 2017	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, par value						$ 0.001							$ 0.001	$ 0.001		$ 0.001
Exercise price per unit of warrant									$ 80.00
Common stock, shares issued						1,474,258							6,111,735	1,474,258		6,111,735
Preferred stock, par value													$ 0.001			$ 0.001
Warrant exercisable period									5 years
Cancellation of warrant description													Additionally, subject to certain exceptions, if, after the June 19, 2018, (i) the volume weighted average price of our common stock for each of 30 consecutive trading days, or the 2018 Measurement Period, which 2018 Measurement Period commences on June 19, 2018, exceeds 300% of the exercise price (subject to adjustments for stock splits, recapitalizations, stock dividends and similar transactions), (ii) the average daily trading volume for such 2018 Measurement Period exceeds $500,000 per trading day and (iii) certain other equity conditions are met, and subject to a beneficial ownership limitation, then we may call for cancellation of all or any portion of the warrants then outstanding.
Number of required consecutive days weighted average trading price for cancelation or recall of warrants									30 days
Minimum required trading price percentage over exercise price for cancelation or recall of warrants									300.00%
Minimum required trading volume value per day for cancelation or recall of warrants									$ 500,000
Gross proceeds from sale of warrants and units													$ 13,800,000
Warrant and units offering cost including underwriting discounts and commissions													1,600,000
Net proceeds from issuance of warrants and units													12,200,000
Proceeds from exercise of warrants													$ 3,231,000	$ 4,199,000	$ 1,324,000
Stock option exercises, Shares													0	0
Restricted stock unit settlements													236	256
Common Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock unit settlements													128	254	267
July 2020 Registered Direct Offering [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Gross proceeds from issuance of common stock			$ 6,000,000					$ 5,600,000
Placement agent fees and offering expenses			700,000					600,000
Proceeds from issuance of common stock			$ 5,300,000					$ 5,000,000
July 2020 Registered Direct Offering [Member] \| Common Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares issued			731,707					89,462					731,707		89,462
Common stock, price per share			$ 8.20					$ 62.89
April 2020 Private Placement [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise price per unit of warrant								$ 62.89
Common stock, shares issued				280,782
Warrant exercisable period								5 years
Number of required consecutive days weighted average trading price for cancelation or recall of warrants													30 days
Maximum number of common shares issuable per warrant upon conversion								0.5
Gross proceeds from issuance of common stock				$ 1,900,000
Warrants to purchase shares of common stock				0.75
Warrants to purchase shares of common stock, offering price per share				$ 6.60
Proceeds from exercise of warrants				$ 1,600,000
Percentage of exercise price exceeds in measurement period													300.00%
Average daily trading volume for measurement period													$ 500,000
April 2020 Private Placement [Member] \| Placement Agent [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise price per unit of warrant				$ 7.59
Number of common shares issuable conversion of warrants				25,270
April 2020 Private Placement [Member] \| Common Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares issued													280,782
December 2019 Public Offering [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise price per unit of warrant							$ 6.60
Offering expenses													$ 34,000
Warrant exercisable period							5 years
Cancellation of warrant description													Additionally, subject to certain exceptions, if, after December 17, 2019, (i) the volume weighted average price of the common stock for each of 30 consecutive trading days, or the 2019 Measurement Period, which 2019 Measurement Period commences on the closing date, exceeds 300% of the exercise price (subject to adjustments for stock splits, recapitalizations, stock dividends and similar transactions), (ii) the average daily trading volume for such 2019 Measurement Period exceeds $500,000 per trading day and (iii) certain other equity conditions are met, and subject to a beneficial ownership limitation, then we may call for cancellation of all or any portion of the warrants then outstanding.
Number of required consecutive days weighted average trading price for cancelation or recall of warrants							30 days
Minimum required trading price percentage over exercise price for cancelation or recall of warrants							300.00%
Minimum required trading volume value per day for cancelation or recall of warrants							$ 500,000
Gross proceeds from sale of warrants and units													$ 13,800,000
Warrant and units offering cost including underwriting discounts and commissions													1,500,000
Net proceeds from issuance of warrants and units													12,300,000
Gross proceeds from issuance of common stock	$ 17,300,000
Proceeds from issuance of common stock	15,800,000
Underwriting discounts and commissions and offering expenses	$ 1,500,000
December 2019 Public Offering [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise price per unit of warrant							$ 1.2
December 2019 Public Offering [Member] \| Representative's Warrant [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of common shares issuable conversion of warrants	50,000
Common stock, price per share	$ 8.75
Adjustments to additional paid in capital	$ 300,000
Warrant exercisable term	5 years
August 2020 Public Offering [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Gross proceeds from issuance of common stock		$ 7,500,000
Proceeds from issuance of common stock		6,800,000											$ 6,822,000
Underwriting discounts and commissions and offering expenses		$ 700,000
August 2020 Public Offering [Member] \| Common Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares issued		569,043											569,043
Common stock, price per share		$ 10.50
Underwriters Over-Allotment Option Exercise [Member] \| Common Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares issued	322,500	92,856
December 2020 Public Offering [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Proceeds from issuance of common stock													$ 15,789,000
December 2020 Public Offering [Member] \| Common Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares issued	2,472,500												2,472,500
Common stock, price per share	$ 7.00
Series A Convertible Preferred Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Preferred stock, par value						$ 0.001							$ 0.001	$ 0.001		$ 0.001
Preferred stock, shares converted						9,158
Preferred stock, shares outstanding						0							0	0		0
Series A Convertible Preferred Stock [Member] \| Common Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Convertible preferred stock, shares issued upon conversion						114,475
Series B Convertible Preferred Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Preferred stock, par value						$ 0.001							$ 0.001	$ 0.001		$ 0.001
Preferred stock, shares outstanding						1,121							0	1,121		0
Series B Convertible Preferred Stock [Member] \| December 2019 Public Offering [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Preferred stock, shares converted													6,256
Preferred stock, shares outstanding													0			0
Series B Convertible Preferred Stock [Member] \| December 2019 Public Offering [Member] \| Common Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Convertible preferred stock, shares issued upon conversion													521,124
Subscription Agreements Executed on April 27, 2020 [Member] \| April 2020 Private Placement [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise price per unit of warrant													$ 7.24			$ 7.24
Subscription Agreements Executed on April 28, 2020 [Member] \| April 2020 Private Placement [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise price per unit of warrant													$ 7.32			$ 7.32
Class A Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Issuance of new units in a public offering									35,525
Public offering, price per unit									$ 80.00
Description of stock units issued													Each Class A Unit consisted of one share of our common stock and a warrant to purchase one share of common stock.
Class A Units [Member] \| December 2019 Public Offering [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Issuance of new units in a public offering							478,875
Public offering, price per unit							$ 12.00
Description of stock units issued													Each Class A Unit consisted of one share of our common stock and a warrant to purchase one share of common stock.
Class B Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Issuance of new units in a public offering									9,158
Public offering, price per unit									$ 1,000
Description of stock units issued													Each Class B Unit consisted of one share of Series A Convertible Preferred Stock, par value $0.001 per share, convertible at any time at the holder’s option into approximately 12 shares of common stock and warrants to purchase approximately 12 shares of common stock.
Number of common shares issuable for each share of convertible preferred stock									12
Number of common shares issuable conversion of warrants									12
Class B Units [Member] \| December 2019 Public Offering [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Issuance of new units in a public offering							6,256
Public offering, price per unit							$ 999.60
Description of stock units issued													Each Class B Unit consisted of one share of Series B Convertible Preferred Stock, par value $0.001 per share, convertible at any time at the holder’s option into 83 shares of common stock, and warrants to purchase 83 shares of common stock.
Number of common shares issuable for each share of convertible preferred stock							83
Number of common shares issuable conversion of warrants							83
Class B Units [Member] \| Series A Convertible Preferred Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Preferred stock, par value									$ 0.001
Class B Units [Member] \| Series A Convertible Preferred Stock [Member] \| December 2019 Public Offering [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Preferred stock, par value							$ 0.001
Pre Funded Warrants \| August 2020 Public Offering [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of common shares issuable conversion of warrants		142,857
Pre-funded warrant, offering price per share		$ 10.499
Pre Funded Warrants \| August 2020 Public Offering [Member] \| Common Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise price per unit of warrant		$ 0.001
Number of days of prior notice to achieve not in excess percentage of common stock shares owned by warrant holder		61 days
Pre Funded Warrants \| August 2020 Public Offering [Member] \| Common Stock [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of shares of common stock owned by warrant holder		19.99%
Pre Funded Warrants \| August 2020 Public Offering [Member] \| Common Stock [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of shares of common stock owned by warrant holder		9.99%
LPC [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock value right to sell, maximum					$ 11,000,000
Common stock, par value					$ 0.001
Minimum percentage of common stock shares outstanding authorized to sell											20.00%
Initial purchase of common stock																1,644
Common stock, shares issued												617
Payments related to expense reimbursement					$ 100,000
Common stock, shares issued													0			27,868
Gross proceeds																$ 4,400,000
Offering expenses																$ 500,000
LPC [Member] \| Purchase Agreement [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, purchase price												$ 1.00
Additional common stock value right to sell, maximum												$ 10,000,000
Additional purchase of common stock, maximum												7,500
Offering expenses													$ 14,000
LPC [Member] \| Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Initial purchase of common stock												1,644
Common stock, purchase price												$ 608
Purchase agreement, description													Unit consisting of (a) one share of our common stock and (b) one warrant to purchase one-quarter of a share of common stock at an exercise price of $699.20 per share, or Warrant. Each Warrant became exercisable six months following the issuance date until the date that is five years and six months after the issuance date and is subject to customary adjustments.
Exercise price per unit of warrant												$ 699.20
Initial purchase of units consisting of common stock and warrants issued												$ 1,000,000
LPC [Member] \| Other Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of warrants issued												0
Ladenburg Thalmann & Co. Inc [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Period granted for underwriting option							45 days			45 days
Ladenburg Thalmann & Co. Inc [Member] \| 2018 Overallotment Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional purchase of common stock and warrants, maximum										22,500
Overallotment option exercise date										Jun. 18, 2018
Ladenburg Thalmann & Co. Inc [Member] \| 2019 Overallotment Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional purchase of common stock and warrants, maximum							150,000
Overallotment option exercise date							Dec. 17, 2019