Liabilities - Convertible Senior Notes - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Non-Cash Interest Expense
Amortization of debt discount/transaction costs			$ 719	$ 10,762
Total Interest Expense	$ 2,709	$ 6,883	8,122	20,423
2023 Notes
Cash Interest Expense
Coupon interest expense	136	889	409	2,667
Non-Cash Interest Expense
Amortization of debt discount/transaction costs	$ 24	1,417	$ 73	4,171
Convertible Debt, Fair Value by Fair Value Hierarchy Level	Level 2		Level 2
Estimated fair value	$ 19,500		$ 19,500
2025 Notes
Cash Interest Expense
Coupon interest expense	1,159	1,159	3,478	3,478
Non-Cash Interest Expense
Amortization of debt discount/transaction costs	$ 115	1,211	$ 341	3,558
Convertible Debt, Fair Value by Fair Value Hierarchy Level	Level 2		Level 2
Estimated fair value	$ 144,300		$ 144,300
2027 Notes
Cash Interest Expense
Coupon interest expense	1,172	1,172	3,516	3,516
Non-Cash Interest Expense
Amortization of debt discount/transaction costs	$ 103	$ 1,035	$ 305	$ 3,033
Convertible Debt, Fair Value by Fair Value Hierarchy Level	Level 2		Level 2
Estimated fair value	$ 191,900		$ 191,900