Long Term Debt - Term Loan Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Debt Instrument [Line Items]
Accretion of amendment fee		$ 51		$ 51
Term loan | Hayfin Loan Agreement Term Loan
Debt Instrument [Line Items]
Interest on principal balance	$ 1,031		$ 2,062
Accretion of original issue discount	14		27
Amortization of deferred financing costs	92		181
Total BT Term Loan interest expense	1,137		2,270
Term loan | Hayfin Loan Agreement Delayed Draw Term Loan
Debt Instrument [Line Items]
Commitment fee	63		126
Accretion of original issue discount	42		83
Amortization of deferred financing costs	271		542
Total BT Term Loan interest expense	$ 376		$ 751
Term loan | BT Term Loan
Debt Instrument [Line Items]
Interest on principal balance		1,891		3,731
Accretion of original issue discount		183		350
Amortization of deferred financing costs		542		1,040
Total BT Term Loan interest expense		$ 2,667		$ 5,172