Fair Value Measurements - Financial Instruments that were not Measured at Fair Value (Details) - Level 2 - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Senior Secured Asset-Based Loan | Carrying Amount
Fair Value, Option, Quantitative Disclosures [Line Items]
Senior Secured Asset-Based Loan	$ 53,408	$ 70,974
Senior Secured Asset-Based Loan | Fair Value
Fair Value, Option, Quantitative Disclosures [Line Items]
Senior Secured Asset-Based Loan	53,408	70,974
Earnout Notes Payable | Carrying Amount
Fair Value, Option, Quantitative Disclosures [Line Items]
Note Payable	4,851	0
Earnout Notes Payable | Fair Value
Fair Value, Option, Quantitative Disclosures [Line Items]
Note Payable	$ 4,851	$ 0