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STOCKHOLDERS' EQUITY - Preferred Stock and Non-Cash Preferred Stock Dividend (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 09, 2018 | Apr. 06, 2017 | Feb. 27, 2017 | Jan. 24, 2017 | Jan. 18, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Mar. 16, 2017
Stockholders' equity |  |  |  |  |  |  |  |  |  |  |
Shares issued | 9,200,000 |  |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ 6.90 |  |  |  |  |  |  |  |  |  |
Offering costs including placement agent fees |  |  |  |  |  |  |  | $ 3,044 |  | $ 11,919 |
Par value of common stock (in dollars per share) | $ 0.0001 |  |  |  |  |  |  | $ 0.0001 |  | $ 0.0001 |
8% Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  | 5,518 |  |  |  |  |  |  |  |
Dividend rate (as a percent) |  |  |  | 8.00% | 8.00% |  |  |  |  |  |
Preferred stock, par value (in dollars per share) |  |  |  | $ 0.0001 |  |  |  |  |  |  |
Number of shares of common stock to be issued upon conversion |  |  |  | 10,000 |  |  |  |  |  |  |
Proceeds from issuance of convertible preferred stock per share |  |  | $ 72,500 |  |  |  |  |  |  |  |
Gross proceeds from preferred stock offering |  |  | $ 400,100 |  |  |  |  |  |  |  |
Share price (in dollars per share) |  |  | $ 7.25 | $ 8.12 |  |  |  |  |  |  |
Offering costs including placement agent fees |  |  | $ 11,900 |  |  |  |  |  |  |  |
Par value of common stock (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 0.0001
Preferred dividend |  |  |  |  |  |  |  |  | $ 0 |  |
Conversion price (in dollars per share) |  |  |  | $ 0.87 |  |  |  |  |  |  |
Beneficial conversion proceeds |  |  |  | $ 48,000 |  |  |  |  |  |  |
Discount amortization period |  |  |  | 65 months |  |  |  |  |  |  |
Amortization of beneficial conversion discount |  |  |  |  |  | $ 47,200 | $ 800 |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |  |  |  |
Shares issued |  | 55,200,000 |  |  |  |  |  |  |  |  |

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