Earnings Per Share - Computation of Basic and Diluted Net Income per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net loss attributable to common stockholders	$ (13,562)	$ (1,293)	$ (41,521)	$ (15,155)
Denominator:
Weighted average shares used to compute net loss per share attributable to common stockholders, basic (in shares)	120,279	115,765	120,201	114,843
Weighted average effect of potentially dilutive shares to purchase common stock (in shares)	0	0	0	0
Weighted average shares used to compute net loss per share attributable to common stockholders, diluted (in shares)	120,279	115,765	120,201	114,843
Net loss per share attributable to common stockholders
Basic (in dollars per share)	$ (0.11)	$ (0.01)	$ (0.35)	$ (0.13)
Diluted (in dollars per share)	$ (0.11)	$ (0.01)	$ (0.35)	$ (0.13)