Long‑Term Debt - Schedule of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Amortization and write-off of deferred debt issuance costs			$ 4,160	$ 430
Other obligations	$ 64	$ 15	97	40
Interest expense	3,861	1,975	8,844	4,821
Interest Rate Swap
Debt Instrument [Line Items]
Interest rate swap	325	288	942	398
Revolving Credit Facility
Debt Instrument [Line Items]
Interest expense for debt	911	1,519	2,490	3,953
Amortization and write-off of deferred debt issuance costs	253	153	1,049	430
Interest expense and amortization of debt issuance costs	1,489	1,960	4,481	4,781
2026 Notes: | Convertible Debt
Debt Instrument [Line Items]
Interest expense for debt	221	0	592	0
Amortization and write-off of deferred debt issuance costs	909	0	2,470	0
Interest expense and amortization of debt issuance costs	1,130	0	3,062	0
2027 Notes: | Convertible Debt
Debt Instrument [Line Items]
Interest expense for debt	551	0	563	0
Amortization and write-off of deferred debt issuance costs	627	0	641	0
Interest expense and amortization of debt issuance costs	$ 1,178	$ 0	$ 1,204	$ 0
Credit Facility
Debt Instrument [Line Items]
Weighted average interest rate over time	2.33%	1.59%	2.02%	1.92%