Liabilities - Convertible Senior Notes - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Non-Cash Interest Expense
Amortization of debt discount/transaction costs			$ 514	$ 477
Total Interest Expense	$ 2,523	$ 2,706	5,103	5,410
2023 Notes
Cash Interest Expense
Coupon interest expense		136	23	272
Non-Cash Interest Expense
Amortization of debt discount/transaction costs		24	4	48
2025 Notes
Cash Interest Expense
Coupon interest expense	737	1,159	1,896	2,318
Non-Cash Interest Expense
Amortization of debt discount/transaction costs	$ 77	114	$ 194	226
Convertible Debt, Fair Value by Fair Value Hierarchy Level	Level 2		Level 2
Estimated fair value	$ 31,900		$ 31,900
2027 Notes
Cash Interest Expense
Coupon interest expense	745	1,172	1,917	2,344
Non-Cash Interest Expense
Amortization of debt discount/transaction costs	$ 70	$ 101	$ 175	$ 202
Convertible Debt, Fair Value by Fair Value Hierarchy Level	Level 2		Level 2
Estimated fair value	$ 49,300		$ 49,300
2029 Notes
Cash Interest Expense
Coupon interest expense	753		753
Non-Cash Interest Expense
Amortization of debt discount/transaction costs	141		141
Estimated fair value	$ 257,000		$ 257,000