Net Loss Per Share - Schedule of Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net loss	$ (54,890)	$ (28,321)	$ (32,849)
Weighted-average common shares outstanding	105,805	102,149	94,865
Net loss per share — basic and diluted (in dollars per share)	$ (0.52)	$ (0.28)	$ (0.35)