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Revenue - Narrative (Details)
$ / shares in Units, $ in Thousands
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
tranche
$ / shares
shares
Class of Warrant or Right [Line Items]      
Fair value of warrants outstanding $ 44,825 $ 343,400  
Contract assets 5,000 0  
Contract liabilities $ 586 $ 2,284  
VCTF warrant      
Class of Warrant or Right [Line Items]      
Number of tranches | tranche     2
Fair value of warrants outstanding     $ 2,900
Class A Common Stock | VCTF warrant      
Class of Warrant or Right [Line Items]      
Conversion of warrants into securities (in shares) | shares     4,089,280
Stock price of warrants (in dollars per share) | $ / shares     $ 3.1769