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RESTRUCTURINGS - 2015 RESTRUCTURING (Details) |  | 12 Months Ended
--- | --- | ---
Mar. 03, 2015 USD ($) position | Dec. 31, 2015 USD ($) | Dec. 31, 2013 USD ($)
Outstanding Restructuring Liability |  |  |
Restructuring charges |  | $ 1,306,000 | $ 1,462,000
Accrual balance at the end of the period |  | 52,000 |
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 |  |
Outstanding Restructuring Liability |  |  |
Restructuring charges |  | 1,395,000 |
Cash payments |  | (947,000) |
Non-cash stock-based compensation expense |  | (307,000) |
Adjustments or non-cash credits |  | (89,000) |
Accrual balance at the end of the period |  | $ 52,000 |

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