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STOCK-BASED COMPENSATION PLANS - Stock Options Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jun. 24, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Proceeds from the exercise of stock options |  | $ 235 | $ 73 | $ 617
2012 plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares available for future issuance under plan |  | 0 |  |
Award expiration period (in years) |  | 10 years |  |
2008 plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares available for future issuance under plan |  | 0 |  |
Stock Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award expiration period (in years) |  | 10 years |  |
Edgewater plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award expiration period (in years) |  | 10 years |  |
Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average grant date fair value (in dollars per share) |  |  |  | $ 3.05
Intrinsic value of options exercised |  | $ 500 | 39 | $ 200
Proceeds from the exercise of stock options |  | 200 | $ 100 | $ 600
Edgewater |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Conversion factor | 17.00% |  |  |
Acquisition consideration (in dollars per share) | $ 1.20 |  |  |
Additional purchase consideration | $ 700 | $ 747 |  |
Fair value of Ribbon Replacement Options | $ 1,000 |  |  |
Fair value of Ribbon Replacement Options, weighted average period (in years) | 2 years |  |  |
Minimum | 2008 plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award expiration period (in years) |  | 7 years |  |
Maximum | 2008 plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award expiration period (in years) |  | 10 years |  |

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