STOCKHOLDERS' EQUITY - EMPLOYEE STOCK PURCHASE PLAN (Details)	12 Months Ended
	Dec. 31, 2015 item shares
STOCKHOLDERS' EQUITY
Shares of common stock reserved for issuance | shares	1,000,000
Aggregate shares issued under plan | shares	57,635
Maximum percentage of annual salary that can be withheld	10.00%
Maximum duration of offering period	12 months
Number of offering periods in which an employee can participate at a time | item	1
Number of consecutive purchase periods in an offering period | item	2
Duration of the purchase period	6 months
Percentage applied to common stock market value in calculating purchase price under purchase plan	85.00%
Duration of the new offering period	12 months