Net Loss Per Share Attributable to Common Shareholders - Schedule of Computation of Basic and Diluted Net Loss Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net loss attributable to common shareholders	$ (15,283)	$ (10,354)
Denominator:
Weighted-average common shares outstanding-basic	77,904	68,381
Dilutive effect of share equivalents resulting from stock options, restricted stock units, and ESPP shares	0	0
Weighted-average common shares outstanding-diluted	77,904	68,381
Net loss per common share, basic and diluted	$ (0.20)	$ (0.15)