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STOCK-BASED COMPENSATION AND STOCK PLANS - Restricted stock activity (Details 3) - Restricted Stock
3 Months Ended
Mar. 31, 2016
$ / shares
shares
Number of Shares  
Unvested as of December 31, 2015 | shares 58,635
Vested | shares (29,306)
Cancelled | shares (53)
Unvested as of March 31, 2016 | shares 29,276
Weighted Average Grant Date Fair Value  
Unvested as of December 31, 2015 | $ / shares $ 2.51
Vested | $ / shares 2.51
Cancelled | $ / shares 2.51
Unvested as of March 31, 2016 | $ / shares $ 2.51