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STOCK-BASED COMPENSATION - Stock Option Activity (Details) - Stock options - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Number of Shares Outstanding    
Beginning balance (in shares) 857,084  
Stock options granted (in shares) 0  
Stock options exercised (in shares) (547,964)  
Stock options cancelled (in shares) (5,845)  
Ending balance (in shares) 303,275 857,084
Exercisable (in shares) 303,275  
Vested and expected to vest (in shares) 303,275  
Weighted-Average Exercise Price    
Beginning balance (in dollars per share) $ 7.63  
Stock options granted (in dollars per share) 0  
Stock options exercised (in dollars per share) 7.60  
Stock options cancelled (in dollars per share) 9.94  
Ending balance (in dollars per share) 7.63 $ 7.63
Exercisable (in dollars per share) 7.63  
Vested and expected to vest (in dollars per share) $ 7.63  
Stock option activity    
Weighted- Average Grant-date Fair Value of Underlying Common Stock $ 0  
Balance, Weighted-Average Remaining Contractual Life 4 years 4 months 24 days 4 years 3 months 18 days
Exercisable, Weighted-Average Remaining Contractual Life 4 years 4 months 24 days  
Vested and expected to vest, Weighted-Average Remaining Contractual Life 4 years 4 months 24 days  
Balance, Aggregate Intrinsic Value $ 3,393 $ 5,616
Exercisable, Aggregate Intrinsic Value 3,393  
Vested and expected to vest, Aggregate Intrinsic Value $ 3,393