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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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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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