Fair Value Measurements - Schedule of Fair Value Measurements, Liabilities Measured on a Recurring Basis (Details) - Fair Value, Recurring - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration	$ 21,319	$ 17,260
Contingent earnout shares	39,936	33,069
Warrant and other long-term liabilities	13	13
Total	61,268	50,342
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration	0	0
Contingent earnout shares	0	0
Warrant and other long-term liabilities	0	0
Total	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration	0	0
Contingent earnout shares	39,936	33,069
Warrant and other long-term liabilities	13	13
Total	39,949	33,082
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration	21,319	17,260
Contingent earnout shares	0	0
Warrant and other long-term liabilities	0	0
Total	$ 21,319	$ 17,260