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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, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from the exercise of stock options		$ 73	$ 617	$ 153
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
2008 plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future issuance under plan		0
2012 plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration period (in years)		10 years
Shares available for future issuance under plan		0
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	$ 4.39
Intrinsic value of options exercised		$ 39	$ 200	$ 42
Proceeds from the exercise of stock options		100	$ 600	$ 200
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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