Debt Obligations - Schedule of Other Financing Obligations (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
Non-cash residual value of Tucker, Georgia lease	$ 0	$ 54,676
Future maturities associated with the Tucker, Georgia failed sale-leaseback liability	0	862
Total leaseback obligations	$ 0	$ 55,538

Financing Obligations, Noncash Residual Value Of Failed Sale-Leaseback Transaction

No definition available.

Name:	thry_FinancingObligationsNoncashResidualValueOfFailedSaleLeasebackTransaction
Namespace Prefix:	thry_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant