Liabilities - Convertible Senior Notes - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Non-Cash Interest Expense
Amortization of debt discount/transaction costs			$ 824	$ 719
Total Interest Expense	$ 2,430	$ 2,709	7,532	8,122
2023 Notes
Cash Interest Expense
Coupon interest expense		136	23	409
Non-Cash Interest Expense
Amortization of debt discount/transaction costs		24	4	73
2025 Notes
Cash Interest Expense
Coupon interest expense	232	1,159	2,128	3,478
Non-Cash Interest Expense
Amortization of debt discount/transaction costs	$ 25	115	$ 218	341
Convertible Debt, Fair Value by Fair Value Hierarchy Level	Level 2		Level 2
Estimated fair value	$ 33,300		$ 33,300
2027 Notes
Cash Interest Expense
Coupon interest expense	234	1,172	2,151	3,516
Non-Cash Interest Expense
Amortization of debt discount/transaction costs	$ 22	$ 103	$ 197	$ 305
Convertible Debt, Fair Value by Fair Value Hierarchy Level	Level 2		Level 2
Estimated fair value	$ 51,900		$ 51,900
2029 Notes
Cash Interest Expense
Coupon interest expense	1,653		2,406
Non-Cash Interest Expense
Amortization of debt discount/transaction costs	$ 264		$ 405
Convertible Debt, Fair Value by Fair Value Hierarchy Level	Level 2		Level 2
Estimated fair value	$ 269,400		$ 269,400