Net Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net loss	$ (15,586)	$ (37,565)
Denominator:
Weighted average shares of common stock outstanding (in shares)	41,618,429	41,248,663
Net loss per share, basic and diluted	$ (0.37)	$ (0.91)