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STOCK-BASED COMPENSATION AND STOCK PLANS - Restricted stock activity (Details 3) - Restricted Stock
3 Months Ended
Mar. 31, 2017
$ / shares
shares
Number of Shares  
Unvested as of December 31, 2016 | shares 29,276
Vested | shares (29,276)
Unvested as of March 31, 2017 | shares
Weighted Average Grant Date Fair Value  
Unvested as of December 31, 2016 | $ / shares $ 2.51
Vested | $ / shares 2.51
Unvested as of March 31, 2017 | $ / shares