Net Income (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, 2020	Mar. 31, 2019
Basic:
Net income (loss), shares, basic	$ 2,828	$ (14,098)
Net income (loss), shares, basic	35,772	25,564
Net income (loss), shares, basic	$ 0.08	$ (0.55)
Weighted-average number of shares of common stock-diluted:
Restricted stock and performance unit awards	86
Diluted:
Net income (loss), shares, diluted	$ 2,828	$ (14,098)
Net income (loss), shares, diluted	35,858	25,564
Net income (loss), shares, diluted	$ 0.08	$ (0.55)