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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, 2020 | Dec. 31, 2019
Assets |  |
Asset fair value, beginning balance | $ 4,000 | $ 0
Transfers in to (out of) Level 3 | 0 | 0
Purchases | 0 | 4,000
Sales | 0 | 0
Realized and Unrealized Gains (Losses) | 1,153 | 0
Asset fair value, ending balance | 5,153 | 4,000
Liabilities |  |
Liability fair value, beginning balance | (31) | (22)
Transfers in to (out of) Level 3 | 0 | 0
Purchases | 0 | 0
Sales | (1,004) | 0
Realized and Unrealized Gains(Losses) (1) | 22 | (9)
Liability fair value, ending balance | (1,013) | (31)
Derivative Financial Instruments, Liabilities |  |
Liabilities |  |
Liability fair value, beginning balance | (31) | (22)
Transfers in to (out of) Level 3 | 0 | 0
Purchases | 0 | 0
Sales | (1,004) | 0
Realized and Unrealized Gains(Losses) (1) | 22 | (9)
Liability fair value, ending balance | (1,013) | (31)
Private Common Equity Securities |  |
Assets |  |
Asset fair value, beginning balance | 1,000 | 0
Transfers in to (out of) Level 3 | 0 | 0
Purchases | 0 | 1,000
Sales | 0 | 0
Realized and Unrealized Gains (Losses) | 0 | 0
Asset fair value, ending balance | 1,000 | 1,000
Private preferred equity securities |  |
Assets |  |
Asset fair value, beginning balance | 3,000 | 0
Transfers in to (out of) Level 3 | 0 | 0
Purchases | 0 | 3,000
Sales | 0 | 0
Realized and Unrealized Gains (Losses) | 0 | 0
Asset fair value, ending balance | 3,000 | 3,000
Derivative Financial Instruments, Assets |  |
Assets |  |
Asset fair value, beginning balance | 0 |
Transfers in to (out of) Level 3 | 0 |
Purchases | 0 |
Sales | 0 |
Realized and Unrealized Gains (Losses) | 1,153 |
Asset fair value, ending balance | $ 1,153 | $ 0

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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