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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

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