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Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Apr. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2019
Realized and Unrealized Gains (Losses) on Financial Instruments |  |  |  |  |
Realized and unrealized gains (losses) on financial instruments, net |  |  | $ (2,019) | $ (2,019) |
Series C common stock | Zero-strike call option |  |  |  |  |
Realized and Unrealized Gains (Losses) on Financial Instruments |  |  |  |  |
Realized and unrealized gains (losses) on financial instruments, net |  |  | $ (2,019) | $ (2,019) |
Derivative underlying share amount | 632,911 | 610,325 | 632,911 | 632,911 | 0
Derivative premium paid |  | $ 47,800 |  |  |
Derivative settlement proceeds | $ 46,500 |  |  |  |

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