Achieve Life Sciences, Inc. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Detail)

Commitments and Contingencies - Additional Information (Detail)			1 Months Ended		3 Months Ended		6 Months Ended
	Dec. 11, 2017 ft²	Aug. 01, 2015 ft²	Jul. 31, 2018	Feb. 28, 2015 USD ($) ft²	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Mar. 01, 2018 USD ($)	Feb. 01, 2015 USD ($)
Other Commitments [Line Items]
Expiration of operating lease agreement							2018-09
Consolidated rent and facilities expense					$ 100,000	$ 0	$ 200,000	$ 0
Indemnification obligations					$ 0		0
Expenses related to indemnification issues							$ 0
Subsequent Event [Member]
Other Commitments [Line Items]
Operating lease agreement extended period month and year			2019-01
Grosvenor International Limited [Member]
Other Commitments [Line Items]
Area of office space leased \| ft²				11,526
Expiration date of option to lease additional area of office space				Aug. 01, 2015
Lease expiration date				Apr. 30, 2018			Mar. 31, 2018
Optional lease renewal				3 years
Monthly base rent commencement date				May 01, 2015
Lessee's share of property tax percentage.				17.00%
Construction allowance received for leasehold improvements										$ 100,000
Deposit amount under lease agreement										$ 200,000
Additional office space \| ft²		2,245
Grosvenor International Limited [Member] \| Minimum [Member]
Other Commitments [Line Items]
Monthly base rent				$ 18,000
Grosvenor International Limited [Member] \| Maximum [Member]
Other Commitments [Line Items]
Monthly base rent				$ 20,000
Pike [Member]
Other Commitments [Line Items]
Area of office space leased \| ft²	3,187
Lease agreement							On December 11, 2017, we entered into a lease, or the Seattle Lease, with 520 Pike Street, Inc., or Pike, pursuant to which we leased approximately 3,187 square feet located at Suite 2250 at 520 Pike Tower, Seattle, Washington, 98101, which commenced on March 1, 2018. The initial term of the Seattle Lease will expire at the end of the month on the third anniversary of the Seattle Lease.
Monthly base rent									$ 11,685,000
Monthly base rent, maximum annual increase									12,397,000
Lease, security deposit, annual payment									37,192,000
Lease, security deposit payment, annual decrease									$ 12,397,000
Percentage of profit attributable to lessor					50.00%		50.00%
Percentage of property if subleased could result in lease termination					50.00%		50.00%