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STOCK-BASED COMPENSATION (Details 2) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Stock option activity |  |  |  |
Outstanding at beginning of year (in shares) | 281,029 |  |  |
Granted (in shares) | 1,197,452 |  |  |
Exercised (in shares) | (121,729) |  |  |
Cancelled (in shares) | (506) |  |  |
Outstanding at end of period (in shares) | 1,356,246 | 281,029 |  |
Exercisable at end of period (in shares) | 208,438 |  |  |
Vested and expected to vest at end of period (in shares) | 1,341,543 |  |  |
Weighted average exercise price per share |  |  |  |
Outstanding at beginning of year (in dollars per share) | $ 0.69 |  |  |
Granted (in dollars per share) | 10.47 |  |  |
Exercised (in dollars per share) | 3.89 |  |  |
Cancelled (in dollars per share) | 2.06 |  |  |
Outstanding at end of period (in dollars per share) | 9.04 | $ 0.69 |  |
Exercisable at end of period (in dollars per share) | 2.65 |  |  |
Vested and expected to vest at end of period (in dollars per share) | $ 9.13 |  |  |
Stock option activity, additional information |  |  |  |
Outstanding at end of period, Weighted-average remaining contractual term | 9 years 2 months 12 days |  |  |
Exercisable at end of period, Weighted-average remaining contractual term | 7 years 10 months 24 days |  |  |
Vested and expected to vest at end of period, weighted-average remaining contractual term | 9 years 2 months 12 days |  |  |
Outstanding at end of period, Aggregate intrinsic value | $ 17,722 |  |  |
Exercisable at end of period, Aggregate intrinsic value | 4,056 |  |  |
Vested and expected to vest at end of period, Aggregate intrinsic value | $ 18,595 |  |  |
Stock options |  |  |  |
Stock option activity |  |  |  |
Outstanding at beginning of year (in shares) | 281,029 | 229,791 | 323,488 |
Granted (in shares) |  | 89,641 | 146,730 |
Exercised (in shares) |  | (32,390) | (1,077) |
Cancelled (in shares) |  | (6,013) | (9,559) |
Modification (in shares) |  |  | (229,791) |
Outstanding at end of period (in shares) |  | 281,029 | 229,791 | 323,488
Exercisable at end of period (in shares) |  | 121,304 |  |
Vested and expected to vest at end of period (in shares) |  | 247,139 |  |
Weighted average exercise price per share |  |  |  |
Outstanding at beginning of year (in dollars per share) | $ 0.69 | $ 1.17 | $ 1.73 |
Granted (in dollars per share) |  | 0.28 | 0.48 |
Exercised (in dollars per share) |  | 2.21 | 0.62 |
Cancelled (in dollars per share) |  | 4.42 | 2.76 |
Modification (in dollars per share) |  |  | 1.17 |
Outstanding at end of period (in dollars per share) |  | 0.69 | $ 1.17 | $ 1.73
Exercisable at end of period (in dollars per share) |  | 1.38 |  |
Vested and expected to vest at end of period (in dollars per share) |  | $ 0.83 |  |
Stock option activity, additional information |  |  |  |
Outstanding at end of period, Weighted-average remaining contractual term |  | 7 years 5 months 27 days | 7 years 7 days | 6 years 11 months 9 days
Exercisable at end of period, Weighted-average remaining contractual term |  | 4 years 3 months 22 days |  |
Vested and expected to vest at end of period, weighted-average remaining contractual term |  | 4 years 3 months 22 days |  |
Outstanding at end of period, Aggregate intrinsic value |  | $ 1,505 | $ 117 | $ 8
Exercisable at end of period, Aggregate intrinsic value |  | 570 |  |
Vested and expected to vest at end of period, Aggregate intrinsic value |  | 1,293 |  |
Unrecognized compensation cost related to outstanding options |  | $ 215 | $ 40 |
Period over which unrecognized compensation cost is expected to be recognized as expense |  | 1 year | 1 year 1 month 6 days |
Weighted average fair value of vested options (in dollars per share) |  | $ 1.93 |  |
Employee stock options |  |  |  |
Stock option activity, additional information |  |  |  |
Weighted-average grant date fair value per share of employee option grants (in dollars per share) |  | $ 0.76 | $ 0.28 |

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