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NET INCOME (LOSS) PER SHARE - Schedule of Computation of EPS (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Numerator:        
Net income—basic $ 19,876 $ 19,081 $ 26,704 $ 29,450
ASU 2020-06 convertible notes if-converted method adjustment 1,039 0 2,078 0
Adjusted net income—diluted $ 20,915 $ 19,081 $ 28,782 $ 29,450
Denominator:        
Weighted average common shares outstanding - basic (in shares) 45,501 44,145 45,185 43,989
Computation of diluted securities:        
Dilutive effect of convertible debt securities (in shares) 0 0 0 76
Weighted average number of shares outstanding - diluted (in shares) 52,478 45,592 52,262 45,779
Net income per share:        
Basic net income per common share (in USD per share) $ 0.44 $ 0.43 $ 0.59 $ 0.67
Diluted net income per common share (in USD per share) $ 0.40 $ 0.42 $ 0.55 $ 0.64
Accounting Standards Update 2020-06        
Computation of diluted securities:        
Dilutive effect of convertible debt securities (in shares) 5,607 0 5,607 0
Employee Stock Option        
Computation of diluted securities:        
Dilutive effect of share based compensation arrangements (in shares) 1,016 1,062 1,106 1,284
Restricted Stock Units (RSUs)        
Computation of diluted securities:        
Dilutive effect of share based compensation arrangements (in shares) 347 381 360 426
ESPP        
Computation of diluted securities:        
Dilutive effect of share based compensation arrangements (in shares) 7 4 4 4