Organization and Significant Accounting Policies - Effect of Accounting Pronouncements (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment in connection with the adoption of ASU 2014-09				$ 8,381
ASSETS
Operating lease right-of-use assets	$ 15,352	$ 15,694
Liabilities
Accrued expenses and other current liabilities	49,930	38,672	$ 36,353
Other long-term liabilities	1,498	884	$ 6,891
Operating lease liabilities, non-current	$ 18,564	19,382
Accounting Standards Update 2016-02
ASSETS
Operating lease right-of-use assets		15,694
Liabilities
Accrued expenses and other current liabilities		2,319
Other long-term liabilities		(6,007)
Operating lease liabilities, non-current		$ 19,382
Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment in connection with the adoption of ASU 2014-09				8,381
Accumulated Deficit | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment in connection with the adoption of ASU 2014-09				$ 8,400