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Summary of Significant Accounting Policies - Additional Information 4 (Detail) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Performance multiplier, minimum | 0.00% |  |
Performance multiplier, maximum | 200.00% |  |
Warrants for Common Stock exercise price | $ 0.01 |  |
Participating securities that share in losses | 0 | 0 |
Interest paid in-kind | $ 20,014 | $ 18,594 |
Convertible Notes |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Interest paid in-kind | $ 20,000 | $ 18,600 |
Restricted Stock |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Shares of unvested restricted stock outstanding | 803,955 |  | 619,867

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