Net Loss per Share of Common Stock - Summary of Computation of Basic and Diluted Net Loss Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net loss attributable to common stockholders- basic and diluted	$ (18,218)	$ (76,333)
Net loss per share- basic and diluted	$ (1.57)	$ (10.64)
Weighted-average common shares used to compute net loss per share- basic and diluted	11,589	7,171