Borrowings - Components of Interest Expense and Related Fees (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
2025 Notes
Line Of Credit Facility [Line Items]
Stated interest expense	$ 10,527	$ 8,750
Amortization of deferred financing costs	1,584	1,177
Total interest and amortization of deferred financing costs	$ 12,111	$ 9,927
Weighted average effective interest rate	8.00%	7.90%
Weighted average outstanding balance	$ 150,575	$ 125,000
August 2026 Notes
Line Of Credit Facility [Line Items]
Stated interest expense	5,453	1,944
Amortization of deferred financing costs	577	192
Total interest and amortization of deferred financing costs	$ 6,030	$ 2,136
Weighted average effective interest rate	4.80%	4.80%
December 2026 Notes
Line Of Credit Facility [Line Items]
Stated interest expense	$ 3,188	$ 142
Amortization of deferred financing costs	372	17
Total interest and amortization of deferred financing costs	$ 3,560	$ 159
Weighted average effective interest rate	4.70%	4.50%
6.00% Convertible Notes due 2025
Line Of Credit Facility [Line Items]
Stated interest expense	$ 3,000	$ 2,992
Amortization of deferred financing costs	639	$ 627
Total interest and amortization of deferred financing costs	$ 3,639
Weighted average effective interest rate	7.30%	7.20%
Total interest and amortization of deferred financing costs and original issue discount		$ 3,619
Credit Suisse Credit Facility
Line Of Credit Facility [Line Items]
Stated interest expense	$ 9	1,771
Amortization of deferred financing costs		2,107
Total interest and amortization of deferred financing costs	9	$ 3,878
Weighted average effective interest rate		7.60%
Weighted average outstanding balance	219	$ 51,044
KeyBank Credit Facility
Line Of Credit Facility [Line Items]
Stated interest expense	8,033	452
Amortization of deferred financing costs	766	68
Total interest and amortization of deferred financing costs	$ 8,799	$ 520
Weighted average effective interest rate	5.90%	4.50%
Weighted average outstanding balance	$ 149,911	$ 63,864