Debt - PPP Loan (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Apr. 17, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Proceeds from PPP loan		$ 0	$ 0	$ 0	$ 795
PPP loan		0		0		$ 529
PPP loan, net of current maturities		0		0		$ 266
Gain on forgiveness of PPP loan		$ 0	$ 0	801	$ 0
Paycheck Protection Program
Debt Instrument [Line Items]
Proceeds from PPP loan	$ 795
Interest rate	1.00%
Gain on forgiveness of PPP loan				$ 801