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Quarterly Information (Unaudited) - Quarterly Unaudited Statements of Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Information (Unaudited)                      
Revenue $ 10,632 $ 26,114 $ 13,530 $ 23,537 $ 33,417 $ 29,856 $ 26,753 $ 21,779 $ 73,813 $ 111,805 $ 29,868
Revenue, Product and Service [Extensible List] us-gaap:ProductMember us-gaap:ProductMember us-gaap:ProductMember us-gaap:ProductMember us-gaap:ProductMember us-gaap:ProductMember us-gaap:ProductMember us-gaap:ProductMember us-gaap:ProductMember us-gaap:ProductMember us-gaap:ProductMember
Total costs and expenses $ 44,448 $ 51,542 $ 41,210 $ 47,214 $ 57,121 $ 40,957 $ 36,091 $ 41,018 $ 184,414 $ 175,187 $ 142,090
Loss from operations (33,816) (25,428) (27,680) (23,677) (23,704) (11,101) (9,338) (19,239) (110,601) (63,382) (112,222)
Net loss $ (37,273) $ (38,463) $ (33,294) $ (29,031) $ (29,225) $ (16,463) $ (14,453) $ (24,345) $ (138,061) $ (84,486) $ (126,757)
Basic and diluted net loss per share (USD per share) $ (0.60) $ (0.66) $ (0.61) $ (0.53) $ (0.58) $ (0.33) $ (0.29) $ (0.50) $ (2.41) $ (1.71) $ (2.61)