Loss per Common Share - Computation of Basic and Diluted Loss per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Numerator:
Net loss	$ (23,330)	$ (26,615)
Denominator:
Weighted-average common shares outstanding—basic and diluted	87,129	35,582
Net loss per common share:
Basic and Diluted	$ (0.27)	$ (0.75)