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RESTRUCTURING - (Details) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 19 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 03, 2015 USD ($) position | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2016 USD ($)
Restructuring |  |  |  |  |  |
Number of positions before restructuring | position | 39 |  |  |  |  |
Number of positions after restructuring | position | 21 |  |  |  |  |
Restructuring charges |  | $ (41,000) |  | $ 1,306,000 | $ 1,306,000 |
Non-cash stock-based compensation expense |  | 5,000 |  | 307,000 |  |
Non-cash adjustment to restructuring charges |  | 89,000 |  | 89,000 |  |
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 |  |  |  |  |  |
Accrual balance at the beginning of the period |  |  | $ 52,000 |  |  |
Cash payments |  |  | (39,000) |  |  | $ (986,000)
Accrual balance at the end of the period |  |  | $ 13,000 |  | $ 52,000 | $ 13,000
One-time termination benefits |  |  |  |  |  |
Restructuring |  |  |  |  |  |
Restructuring charges |  | $ 48,000 |  | $ 1,395,000 |  |

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