Earnings (Loss) Per Share - Calculation of Basic and Diluted Weighted-Average Number of Shares of Common Stock and EPS (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Basic:
Net loss, basic	$ (14,098)	$ (2,626)
Net loss, shares, basic	25,564	19,563
Net loss, per share, basic	$ (0.55)	$ (0.13)
Diluted:
Net loss, diluted	$ (14,098)	$ (2,626)
Net loss, shares, diluted	25,564	19,563
Net loss, per share, diluted	$ (0.55)	$ (0.13)