Summary of Significant Accounting Policies - Recently adopted accounting pronouncements (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Jan. 01, 2022	Dec. 31, 2021
Summary of Significant Accounting Policies
Retained earnings (accumulated deficit)	$ (1,766,341)		$ (1,537,988)
ASU 2020-06 | Cumulative effect period of adoption adjustment
Summary of Significant Accounting Policies
Unamortized debt discount		$ (27,500)
Retained earnings (accumulated deficit)		60,700
Capital in excess of par value		$ (81,900)