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Summary of Significant Accounting Policies - Derecognition of Balances (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Leases      
Property and equipment, net $ 14,020 $ 10,887  
Other current liabilities   2,682  
Accumulated deficit $ (665,197) $ (549,221)  
ASU 2016-02 | Cumulative effect adjustment for adoption of new accounting guidance      
Leases      
Property and equipment, net     $ 32,627
Other current liabilities     (1,014)
Construction financing lease obligation, net of current portion     (32,417)
Accumulated deficit     $ 803