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Fair Value Measurements - Schedule of reconciliation of the balances for all investments measured at fair value using significant unobservable inputs (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Assets |  |
Asset fair value, beginning balance | $ 0 | $ 107,075
Transfers in to (out of) Level 3 | 0 | 0
Purchases | 4,000 | 76,973
Sales | 0 | (177,570)
Realized and Unrealized Gains (Losses) | 0 | (6,478)
Asset fair value, ending balance | 4,000 | 0
Liabilities |  |
Liability fair value, beginning balance | (22) | (2,256)
Transfers in to (out of) Level 3 | 0 | 0
Purchases | 0 | 0
Sales | 0 | 1,797
Realized and Unrealized Gains(Losses) (2) | (9) | 437
Liability fair value, ending balance | (31) | (22)
Derivative liabilities (free standing) |  |
Liabilities |  |
Liability fair value, beginning balance | 0 | (2,085)
Transfers in to (out of) Level 3 |  | 0
Purchases |  | 0
Sales |  | 1,797
Realized and Unrealized Gains(Losses) (2) |  | 288
Liability fair value, ending balance |  | 0
Derivative liabilities (embedded) |  |
Liabilities |  |
Liability fair value, beginning balance | (22) | (171)
Transfers in to (out of) Level 3 | 0 | 0
Purchases | 0 | 0
Sales | 0 | 0
Realized and Unrealized Gains(Losses) (2) | (9) | 149
Liability fair value, ending balance | (31) | (22)
Private Common Equity Securities |  |
Assets |  |
Asset fair value, beginning balance | 0 | 4,794
Transfers in to (out of) Level 3 | 0 | 0
Purchases | 1,000 | 567
Sales | 0 | (4,726)
Realized and Unrealized Gains (Losses) | 0 | (635)
Asset fair value, ending balance | 1,000 | 0
Private preferred equity securities |  |
Assets |  |
Asset fair value, beginning balance | 0 | 57,126
Transfers in to (out of) Level 3 | 0 | 0
Purchases | 3,000 | 38,376
Sales | 0 | (91,065)
Realized and Unrealized Gains (Losses) | 0 | (4,437)
Asset fair value, ending balance | 3,000 | 0
Asset-backed securities |  |
Assets |  |
Asset fair value, beginning balance | 0 | 27,308
Transfers in to (out of) Level 3 |  | 0
Purchases |  | 35,905
Sales |  | (60,906)
Realized and Unrealized Gains (Losses) |  | (2,307)
Asset fair value, ending balance |  | 0
Corporate bonds |  |
Assets |  |
Asset fair value, beginning balance | 0 | 9,868
Transfers in to (out of) Level 3 |  | 0
Purchases |  | 1,372
Sales |  | (11,763)
Realized and Unrealized Gains (Losses) |  | 523
Asset fair value, ending balance |  | 0
Other debt securities |  |
Assets |  |
Asset fair value, beginning balance | 0 | 713
Transfers in to (out of) Level 3 |  | 0
Purchases |  | 0
Sales |  | (913)
Realized and Unrealized Gains (Losses) |  | 200
Asset fair value, ending balance |  | 0
Rights and warrants |  |
Assets |  |
Asset fair value, beginning balance | 0 | 435
Transfers in to (out of) Level 3 |  | 0
Purchases |  | 753
Sales |  | (1,380)
Realized and Unrealized Gains (Losses) |  | 192
Asset fair value, ending balance |  | 0
Real estate |  |
Assets |  |
Asset fair value, beginning balance | $ 0 | 6,831
Transfers in to (out of) Level 3 |  | 0
Purchases |  | 0
Sales |  | (6,817)
Realized and Unrealized Gains (Losses) |  | (14)
Asset fair value, ending balance |  | $ 0

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