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Fair Value Measurements - Schedule of Liability for Derivatives and Warrants (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value Disclosures [Abstract]    
Fair Values of Derivatives, Convertible Notes at beginning $ 1,203 $ 1,018
Fair Values of Derivatives, Convertible Notes Change in fair value (206) (678)
Fair Values of Derivatives, Convertible Notes Additions 3,583 863
Fair Values of Derivatives, Convertible Notes Redemptions (4,580)
Fair Values of Derivatives, Reclassification of warrant liabilities  
Fair Values of Derivatives, Convertible Notes at end 1,203
Profits Interests Sold at beginning 1,971
Profits Interests Sold Change in fair value (1,971) 198
Profits Interests Sold Additions 1,773
Profits Interests Sold Redemptions
Profits Interests Sold Reclassification of warrant liabilities  
Profits Interests Sold at end 1,971
Embedded Put Option, at beginning 376
Embedded Put Option, Change in fair value (220) (137)
Embedded Put Option, Additions 172 589
Embedded Put Option, Redemptions (328) (76)
Embedded Put Option, Reclassification of warrant liabilities  
Embedded Put Option, at end 376
Warrant liabilities, at beginning 24 4,528
Warrant liabilities, Change in fair value 83,338
Warrant liabilities, Additions 50,743
Warrant liabilities, Redemptions (97,884)
Warrant liabilities, Reclassification of warrant liabilities (13,535)  
Warrant liabilities, at end $ 22,686 $ 24