Summary of Reconciliation of Numerators and Denominators of Basic and Diluted Net Income (Loss) Per Share of Common Stock Computations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net income (loss)	$ 3,395	$ (37,424)	$ (13,538)	$ (47,511)
Denominator:
Weighted-average shares of common stock outstanding—basic	39,432,030	38,647,775	39,361,596	38,565,258
Net effect of dilutive common stock equivalents	566,000
Weighted average common stock outstanding for diluted net income (loss) per share	39,997,571	38,647,775	39,361,596	38,565,258
Net income (loss) per share of common stock
Net income (loss) per share of common stock—basic	$ 0.09	$ (0.97)	$ (0.34)	$ (1.23)
Net income (loss) per share of common stock—diluted	$ 0.08	$ (0.97)	$ (0.34)	$ (1.23)