Warrant Liabilities - Summary of outstanding warrants (Details) - USD ($) $ in Thousands			12 Months Ended
	May 29, 2020	May 28, 2020	Dec. 31, 2020	Dec. 31, 2019
Shares
Ending balance (in shares)			56,494,855
Amount
Beginning balance			$ 18
Fair value adjustments			3,767	$ 0
Ending balance			$ 15,389	$ 18
Private and Seller Warrants
Shares
Beginning balance (in shares)			12,621,623
Additions (in shares)			10,240,000
Transfers (in shares)			(351,585)
Ending balance (in shares)			22,510,038	12,621,623
Amount
Beginning balance			$ 18
Additions			12,185
Transfers			(581)
Fair value adjustments			3,767
Ending balance			$ 15,389	$ 18
5-Year Private Warrants
Shares
Beginning balance (in shares)			0
Additions (in shares)	2,500,000	7,740,000	10,240,000
Transfers (in shares)			(351,585)
Ending balance (in shares)	7,740,000		9,888,415	0
Amount
Beginning balance			$ 0
Additions			12,185
Transfers			(581)
Fair value adjustments			3,722
Ending balance			$ 15,326	$ 0
Seller Warrants
Shares
Beginning balance (in shares)			12,621,623
Additions (in shares)			0
Transfers (in shares)			0
Ending balance (in shares)	12,700,000		12,621,623	12,621,623
Amount
Beginning balance			$ 18
Additions			0
Transfers			0
Fair value adjustments			45
Ending balance			$ 63	$ 18