Net Income (Loss) Per Share Attributable to Common Stockholders - Schedule of Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted Net Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net loss	$ (30,025)	$ (20,650)
Adjustment to redemption value on redeemable convertible preferred stock		(362)
Deemed dividend on settlement of accrued dividend		42,530
Undistributed earnings allocated to participating securities		(18,131)
Net income (loss) attributable to common stockholders, basic	(30,025)	3,387
Undistributed earnings reallocated to dilutive potential common shares		774
Net income (loss) attributable to common stockholders, diluted	$ (30,025)	$ 4,161
Denominator:
Weighted-average shares of common stock, basic	42,760	4,388
Effect of dilutive stock options		1,242
Weighted-average shares of common stock, diluted	42,760	5,630
Net income (loss) per share attributable to common stockholders
Basic	$ (0.70)	$ 0.77
Diluted	$ (0.70)	$ 0.74