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STOCKHOLDERS' EQUITY-Common stock and warrants (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 09, 2018 | Apr. 06, 2017 | Sep. 09, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Stockholders' equity |  |  |  |  |
Shares issued | 9,200,000 | 55,200,000 | 90,000,000 |  |
Authorized shares of common stock, after amendment of certificate of incorporation |  |  | 1,000,000,000 | 1,000,000,000 | 1,000,000,000
Common stock, par value (in dollars per share) | $ 0.0001 |  | $ 0.0001 | $ 0.0001 | $ 0.0001
Share price (in dollars per share) | $ 6.90 |  |  |  |
Number of warrants issued |  |  | 4,700,000 |  |
Equivalent number shares of the warrants |  |  | 4,700,000 |  |
Exercise price (in dollars per share) |  |  | $ 14.04 |  |
Additional paid-in capital |  |  | $ 571,114 | $ 1,095,367 | $ 1,016,281
Authorized shares of capital stock, after amendment of certificate of incorporation |  |  | 1,001,000,000 |  |
Net proceeds issuance of common stock | $ 60,400 |  |  | $ 63,480 |
Warrants Issued to Former Holders of Unsecured and Convertible Notes |  |  |  |  |
Stockholders' equity |  |  |  |  |
Exercise price (in dollars per share) |  |  | $ 14.04 |  |
Preferred stock |  |  |  |  |
Stockholders' equity |  |  |  |  |
Preferred stock, par value (in dollars per share) |  |  | $ 0.0001 |  |
Authorized shares of preferred stock, after amendment of certificate of incorporation |  |  | 1,000,000 |  |
Predecessor |  |  |  |  |
Stockholders' equity |  |  |  |  |
Additional paid-in capital |  |  | $ 3,287,906 |  |

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- Definition The maximum number of capital stock permitted to be issued by an entity's charter and bylaws. + References No definition available. + Details
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- Definition Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares. + References No definition available. + Details
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- Definition Number of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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