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STOCKHOLDERS' EQUITY - Common stock and warrants (Details) $ / shares in Units, $ in Thousands |  |  |  | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 08, 2019 series $ / shares shares | Oct. 02, 2019 $ / shares | Feb. 09, 2018 USD ($) $ / shares shares | Oct. 01, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 $ / shares shares | Dec. 31, 2019 $ / shares shares | Aug. 02, 2019 | Sep. 09, 2016 $ / shares shares
Stockholders' equity |  |  |  |  |  |  |  |  |
Shares issued | 16,200,000 |  | 9,200,000 |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.0001 |  | $ 0.0001 |  |  | $ 0.0001 | $ 0.0001 |  |
Share price (in dollars per share) | $ / shares |  | $ 19.74 | $ 6.90 |  |  |  |  |  |
Percentage of shares of class of directors | 85.00% |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock | $ |  |  | $ 60,400 | $ 155,929 | $ 63,480 |  |  |  |
Number of warrants issued |  |  |  |  |  |  |  |  | 4,700,000
Equivalent number shares of the warrants |  |  |  |  |  |  |  |  | 4,700,000
Annualized Rate Of Increase To The Strike Price Of Warrants Issued | 6.75 | 6.75 |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 14.04
Warrant term (in years) | 3 years |  |  |  |  |  |  |  |
Authorized shares of capital stock, after amendment of certificate of incorporation | 101,000,000 |  |  |  |  |  |  |  |
Authorized shares of common stock, after amendment of certificate of incorporation | 100,000,000 |  |  |  |  | 100,000,000 | 100,000,000 |  |
Number of series of warrants | series | 3 |  |  |  |  |  |  |  |
Number of shares of common stock that can be purchased from warrants | 1 |  |  |  |  |  |  |  |
Series A Warrants |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |  |
Number of warrants issued |  |  |  |  |  | 1,800,000 |  |  |
Warrants issued | 1,798,322 |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ / shares | $ 40.17 |  |  |  |  | $ 42.65 |  |  |
Series B Warrants |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |  |
Number of warrants issued |  |  |  |  |  | 2,200,000 |  |  |
Warrants issued | 2,247,985 |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ / shares | $ 48.28 |  |  |  |  | $ 51.43 |  |  |
Series C Warrants |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |  |
Number of warrants issued |  |  |  |  |  | 2,900,000 |  |  |
Warrants issued | 2,890,271 |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ / shares | $ 60.45 |  |  |  |  | $ 64.59 |  |  |
The Restructuring Support Agreement |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |  |
Warrant term (in years) |  |  |  |  |  |  |  | 3 years |
Preferred Stock |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.0001 |  |  |  |  |  |  |  |
Authorized shares of preferred stock, after amendment of certificate of incorporation | 1,000,000 |  |  |  |  |  |  |  |

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