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EQUITY (Details 2) $ / shares in Units, $ in Thousands | 1 Months Ended | 2 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2015 | Dec. 31, 2013 USD ($) $ / shares | Feb. 29, 2012 USD ($) $ / shares shares | Sep. 30, 2013 USD ($) $ / shares shares | Dec. 31, 2013 USD ($) tranche $ / shares shares | Sep. 30, 2015 $ / shares | Dec. 31, 2014 $ / shares
Performance Adjustment |  |  |  |  |  |  |
Performance adjustment ratio | 0.144927536 |  |  |  |  |  |
Common stock |  |  |  |  |  |  |
Performance Adjustment |  |  |  |  |  |  |
Performance adjustment ratio |  | 0.5 |  |  |  |  |
Series A convertible redeemable preferred stock |  |  |  |  |  |  |
Preferred stock |  |  |  |  |  |  |
Convertible redeemable preferred stock, par value (in dollars per share) | $ / shares |  | $ 0.001 | $ 0.001 |  | $ 0.001 | $ 0.001 | $ 0.001
Performance Adjustment |  |  |  |  |  |  |
Performance adjustment ratio |  | 0.5 |  |  |  |  |
Performance Adjustment |  | $ 12,239 |  |  | $ 12,239 |  |
Series B convertible redeemable preferred stock |  |  |  |  |  |  |
Preferred stock |  |  |  |  |  |  |
Convertible redeemable preferred stock, par value (in dollars per share) | $ / shares |  | $ 0.001 | $ 0.001 |  | $ 0.001 | 0.001 | 0.001
Series C convertible redeemable preferred stock |  |  |  |  |  |  |
Preferred stock |  |  |  |  |  |  |
Issuance of stock (in shares) | shares |  |  |  |  | 8,658,008 |  |
Convertible redeemable preferred stock, par value (in dollars per share) | $ / shares |  | 0.001 |  |  | $ 0.001 | $ 0.001 | $ 0.001
Series B Preferred Stock financing February 2012 | Series B convertible redeemable preferred stock |  |  |  |  |  |  |
Preferred stock |  |  |  |  |  |  |
Issuance of stock (in shares) | shares |  |  | 27,324,237 |  |  |  |
Issue price (in dollars per share) | $ / shares |  |  | $ 0.84 |  |  |  |
Gross proceeds |  |  | $ 20,050 |  |  |  |
Closing costs |  |  | $ 147 |  |  |  |
Series C Preferred Stock financing 2013 | Series C convertible redeemable preferred stock |  |  |  |  |  |  |
Preferred stock |  |  |  |  |  |  |
Issuance of stock (in shares) | shares |  |  |  |  | 8,658,008 |  |
Gross proceeds |  |  |  |  | $ 12,000 |  |
Closing costs |  |  |  |  | $ 45 |  |
Number of tranches into which financing was structured | tranche |  |  |  |  | 2 |  |
Series C Preferred Stock financing 2013 | Series C convertible redeemable preferred stock | Maximum |  |  |  |  |  |  |
Preferred stock |  |  |  |  |  |  |
Shares authorized for sale and issuance (in shares) | shares |  |  |  |  | 8,658,008 |  |
Amount authorized for sale and issuance |  |  |  |  | $ 12,000 |  |
Series C Preferred Stock financing 2013 | Series C convertible redeemable preferred stock | Stock purchase right |  |  |  |  |  |  |
Preferred stock |  |  |  |  |  |  |
Stock purchase right liability |  |  |  | $ 266 |  |  |
Series C Preferred Stock financing 2013, first tranche | Series C convertible redeemable preferred stock |  |  |  |  |  |  |
Preferred stock |  |  |  |  |  |  |
Issuance of stock (in shares) | shares |  |  |  | 2,886,004 |  |  |
Gross proceeds |  |  |  | $ 4,000 |  |  |
Series C Preferred Stock financing 2013, second tranche | Series C convertible redeemable preferred stock | Stock purchase right |  |  |  |  |  |  |
Fair value assumptions |  |  |  |  |  |  |
Fair value of stock (in dollars per share) | $ / shares |  | $ 1.27 |  | $ 1.30 | $ 1.27 |  |
Expected life |  | 1 month 28 days |  |  |  |  |
Volatility (as a percent) |  | 52.00% |  |  |  |  |
Roll forward of the recurring fair value measurements of the tranche liability categorized with Level 3 inputs |  |  |  |  |  |  |
Tranche liability upon issuance |  | $ 266 |  |  |  |  |
Change in fair value |  | 79 |  |  |  |  |
Tranche liability upon close of tranche |  | $ (345) |  |  |  |  |
Series C Preferred Stock financing 2013, second tranche | Series C convertible redeemable preferred stock | Stock purchase right | Minimum |  |  |  |  |  |  |
Fair value assumptions |  |  |  |  |  |  |
Expected life |  |  |  | 4 months 6 days |  |  |
Volatility (as a percent) |  |  |  | 53.00% |  |  |
Series C Preferred Stock financing 2013, second tranche | Series C convertible redeemable preferred stock | Stock purchase right | Maximum |  |  |  |  |  |  |
Fair value assumptions |  |  |  |  |  |  |
Expected life |  |  |  | 5 months 5 days |  |  |
Volatility (as a percent) |  |  |  | 60.00% |  |  |
Conversion of preferred stock into Series A Preferred Stock | Series A convertible redeemable preferred stock |  |  |  |  |  |  |
Preferred stock |  |  |  |  |  |  |
Number of shares issued in exchange for previously outstanding stock (in shares) | shares |  |  | 18,464,674 |  |  |  |

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