NET INCOME PER SHARE- Reconciliation of Weighted Average Shares Outstanding (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Basic
Net income	$ 9,580	$ 9,156	$ 2,025	$ (1,683)	$ 18,736	$ 342
Undistributed earnings allocated to participating securities	(247)		(61)		(494)	(11)
Net income attributable to common stockholders—basic	$ 9,333		$ 1,964		$ 18,242	$ 331
Weighted average shares used in computing net income per share attributable to common stockholders - basic (in shares)	150,690		149,517		150,498	149,350
Net income (loss) per share attributable to common stockholders - basic (in dollars per share)	$ 0.06		$ 0.01		$ 0.12	$ 0
Diluted
Net income attributable to common stockholders—diluted	$ 9,333		$ 1,964		$ 18,242	$ 331
Number of shared used for basic EPS calculation (in shares)	150,690		149,517		150,498	149,350
Effect of dilutive securities (in shares)	75		168		160	171
Weighted average shares used in computing net income (loss) per share attributable to common stockholders - diluted (in shares)	150,765		149,685		150,658	149,521
Net income (loss) per share attributable to common stockholders - diluted (in dollars per share)	$ 0.06		$ 0.01		$ 0.12	$ 0