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Basis of Presentation and Summary of Significant Accounting Policies - Supplemental Balance Sheet Information Regarding Leases (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Accounting Policies [Abstract] |  |  |
Property and equipment, net | $ 32,332 | $ 1,057 | $ 27,757
Operating lease right-of-use assets | 27,520 | 28,432 |
Operating lease liabilities (current) | 6,684 | 5,699 |
Operating lease liabilities (noncurrent) | 35,291 | 36,957 |
Accounts payable, accrued expenses and other current liabilities | (33,566) | (1,548) | (58,430)
Other liabilities |  | (11,656) |
Accumulated deficit | $ (23,498) | $ 37 | $ (64,031)

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