RESTRUCTURING (Details)		3 Months Ended	9 Months Ended
	Mar. 03, 2015 USD ($) position	Sep. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)
Outstanding Restructuring Liability
Restructuring charges		$ (41,000)	$ 1,306,000
Accrual balance at the end of the period		78,000	78,000
March 2015 Restructuring
RESTRUCTURING
Number of positions before restructuring | position	39
Number of positions after restructuring | position	21
Original exercise period for vested outstanding awards after termination	90 days
Modified exercise period for vested outstanding awards after termination	1 year
Expected cash payments	$ 999,000
March 2015 Restructuring | One-time termination benefits
Outstanding Restructuring Liability
Restructuring charges		48,000	1,395,000
Cash payments			(921,000)
Non-cash stock-based compensation expense		(5,000)	(307,000)
Adjustments or non-cash credits		(89,000)	(89,000)
Accrual balance at the end of the period		$ 78,000	$ 78,000