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EQUITY (Details 3) $ / shares in Units, $ in Thousands | 1 Months Ended | 2 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2015 | Dec. 31, 2013 USD ($) | Feb. 28, 2015 | Dec. 31, 2014 USD ($) director installment $ / shares shares | Dec. 31, 2013 USD ($)
Performance Adjustment |  |  |  |  |
Performance adjustment ratio | 0.144927536 |  |  |  |
Common stock |  |  |  |  |
Performance Adjustment |  |  |  |  |
Performance adjustment ratio |  | 0.5 |  |  |
Redeemable Convertible Preferred Stock |  |  |  |  |
Equity |  |  |  |  |
Optional redemption feature, number of installment payments | installment |  |  |  | 3 |
Redeemable Convertible Preferred Stock | Minimum |  |  |  |  |
Equity |  |  |  |  |
Affirmative vote of outstanding shares for optional redemption (as a percent) |  |  |  | 60.00% |
Redeemable Convertible Preferred Stock | Mandatory conversion, initial public offering | Minimum |  |  |  |  |
Equity |  |  |  |  |
Gross proceeds from sale of stock | $ |  |  |  | $ 50,000 |
Issue price (in dollars per share) | $ / shares |  |  |  | $ 20.70 |
Redeemable Convertible Preferred Stock | Automatic conversion concurrently with Qualified Financing | Minimum |  |  |  |  |
Equity |  |  |  |  |
Shares owned by a shareholder (in shares) | shares |  |  |  | 1,000,000 |
Gross proceeds from sale of stock | $ |  |  |  | $ 1,000 |
Series A convertible redeemable preferred stock |  |  |  |  |
Equity |  |  |  |  |
Number of directors holders of record are entitled to elect | director |  |  |  | 2 |
Dividend rate (as a percent) |  |  | 4.50% | 4.50% |
Cumulative accrued dividends | $ |  | $ 2,371 |  | $ 2,371 | $ 2,371
Conversion price (in dollars per share) | $ / shares |  |  |  | $ 8.46 |
Liquidation rights, ratio applied to original issue price |  |  |  | 1 |
Liquidation rights, original issue price (in dollars per share) | $ / shares |  |  |  | $ 8.46 |
Performance Adjustment |  |  |  |  |
Performance adjustment ratio |  | 0.5 |  |  |
Performance Adjustment | $ |  | $ 12,239 |  |  | 12,239
Series A convertible redeemable preferred stock | Minimum |  |  |  |  |
Equity |  |  |  |  |
Written consent or affirmative vote of outstanding shares to amend, alter or repeal the preferences, special rights or other powers (as a percent) |  |  |  | 66.00% |
Series B convertible redeemable preferred stock |  |  |  |  |
Equity |  |  |  |  |
Number of directors holders of record are entitled to elect | director |  |  |  | 1 |
Dividend rate (as a percent) |  |  | 8.00% | 8.00% |
Cumulative accrued dividends | $ |  |  |  | $ 5,307 |
Conversion price (in dollars per share) | $ / shares |  |  |  | $ 5.80 |
Liquidation rights, ratio applied to original issue price |  |  |  | 2 |
Liquidation rights, original issue price (in dollars per share) | $ / shares |  |  |  | $ 5.80 |
Optional redemption feature, ratio applied to original price |  |  |  | 2 |
Series B convertible redeemable preferred stock | Minimum |  |  |  |  |
Equity |  |  |  |  |
Written consent or affirmative vote of outstanding shares to amend, alter or repeal the preferences, special rights or other powers (as a percent) |  |  |  | 66.00% |
Series C convertible redeemable preferred stock |  |  |  |  |
Equity |  |  |  |  |
Number of directors holders of record are entitled to elect | director |  |  |  | 1 |
Dividend rate (as a percent) |  |  | 8.00% | 8.00% |
Cumulative accrued dividends | $ |  |  |  | $ 1,114 |
Conversion price (in dollars per share) | $ / shares |  |  |  | $ 9.59 |
Liquidation rights, ratio applied to original issue price |  |  |  | 1 |
Liquidation rights, original issue price (in dollars per share) | $ / shares |  |  |  | $ 9.59 |
Series C convertible redeemable preferred stock | Minimum |  |  |  |  |
Equity |  |  |  |  |
Written consent or affirmative vote of outstanding shares to amend, alter or repeal the preferences, special rights or other powers (as a percent) |  |  |  | 66.00% |
Series C convertible redeemable preferred stock | Series C Preferred Stock financing 2013, second tranche |  |  |  |  |
Performance Adjustment |  |  |  |  |
Threshold of additional capital raised to trigger Performance Adjustment | $ |  |  |  |  | $ 4,000

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