STOCKHOLDERS' EQUITY - 401(k) PLAN (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2013
401(k) Plan
Period of vesting of matching contributions		4 years
Service period of employees		4 years
Operating expenses as a result of accelerated vesting of unvested prior employer matches for employees affected by recent restructurings	$ 53,000	$ 266,000
Unvested amount under the defined-contribution savings plan to be amortized	$ 111,000