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

Common Stock - Summary of Outstanding Warrants (Detail)	3 Months Ended
Common Stock - Summary of Outstanding Warrants (Detail)	Mar. 31, 2018 $ / shares shares
Series A Warrants [Member]
Class of Warrant or Right [Line Items]
Total Outstanding and Exercisable \| shares	252,721
Exercise price per Share \| $ / shares	$ 44.000
Expiration Date	2019-07
Series B Warrants [Member]
Class of Warrant or Right [Line Items]
Total Outstanding and Exercisable \| shares	60,933
Exercise price per Share \| $ / shares	$ 44.000
Expiration Date	2019-07
Series A-1 Warrants [Member]
Class of Warrant or Right [Line Items]
Total Outstanding and Exercisable \| shares	21,748
Exercise price per Share \| $ / shares	$ 26.400
Expiration Date	2020-10
Warrants Issued In September 2017 [Member]
Class of Warrant or Right [Line Items]
Total Outstanding and Exercisable \| shares	82,237
Exercise price per Share \| $ / shares	$ 3.496
Expiration Date	2023-03