EMPLOYEE STOCK PLANS - Unvested Options (Details) - Employee stock option - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Number of Options
Unvested number of options outstanding, beginning of year (in shares)	176,697
Granted (in shares)	5,000	5,000	17,500
Vested (in shares)	(60,085)
Forfeited (in shares)	(26,195)
Unvested number of options outstanding, end of year (in shares)	95,417	176,697
Weighted Average Grant Date Fair Value
Unvested number of options outstanding, beginning of year (in dollars per share)	$ 4.89
Granted (in dollars per share)	2.14	$ 3.17
Vested (in dollars per share)	4.73
Forfeited (in dollars per share)	5.36
Unvested number of options outstanding, end of year (in dollars per share)	$ 4.72	$ 4.89