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

Common Stock - Computation of Basic and Diluted Net Loss Attributable to Common Shareholders Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Numerator
Net loss	$ (1,722)	$ (4,550)	$ (6,010)	$ (4,517)	$ (5,682)	$ (4,907)	$ (7,015)	$ (8,636)	$ (16,801)	$ (26,240)	$ (31,849)
Denominator
Weighted average number of common shares outstanding									26,147,344	18,098,799	14,683,389
Basic and diluted net loss per common share	$ (0.06)	$ (0.16)	$ (0.26)	$ (0.20)	$ (0.26)	$ (0.23)	$ (0.47)	$ (0.59)	$ (0.64)	$ (1.45)	$ (2.17)

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.