Net Income (Loss) per Share - Calculation of Basic and Diluted Net Income (Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net loss	$ (7,475)	$ (1,235)
Denominator:
Weighted-average shares, basic (in shares)	37,846	36,694
Weighted-average common shares outstanding, diluted (in shares)	37,846	36,694
Net loss per share:
Basic (in dollars per share)	$ (0.20)	$ (0.03)
Diluted (in dollars per share)	$ (0.20)	$ (0.03)