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STOCKHOLDERS' EQUITY - Schedule of Share-based Compensation, Stock Options, Activity (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Shares  
Outstanding at the beginning of the year (in shares) | shares 1,685,000
Granted (in shares) | shares 771,000
Exercised (in shares) | shares (130,000)
Canceled (in shares) | shares (1,054,000)
Outstanding at the end of the year (in shares) | shares 1,272,000
Vested and expected to vest (in shares) | shares 1,256,000
Exercisable (in shares) | shares 375,000
Weighted Average Exercise Price  
Outstanding at the beginning of the year (in USD per share) | $ / shares $ 9.71
Granted (in USD per share) | $ / shares 6.52
Exercised (in USD per share) | $ / shares 5.55
Canceled (in USD per share) | $ / shares 10.06
Outstanding at the end of the year (in USD per share) | $ / shares 7.92
Vested and expected to vest (in USD per share) | $ / shares 8.55
Exercisable (in USD per share) | $ / shares $ 7.91
Additional Disclosures  
Outstanding weighted average remaining contractual term (in years) 3 years 4 months 24 days
Vested and expected to vest weighted average remaining contractual term (in years) 3 years 2 months 12 days
Exercisable weighted average remaining contractual term (in years) 2 years 1 month 6 days
Outstanding, aggregate intrinsic value | $ $ 533
Vested and expected to vest, aggregate intrinsic value | $ 456
Exercisable, aggregate intrinsic value | $ $ 98