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Income Taxes - Effective Income Tax Reconciliation (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]                        
Federal statutory rate                   35.00% 35.00% 35.00%
Effect of:                        
Tax benefit at federal statutory rate                   $ (15,528) $ (15,384) $ (15,192)
State taxes, net of federal benefit                   (1,802) (1,377) (1,833)
Revaluation of deferred tax items due to tax rate change (federal and state)                   22,880 0 0
Revaluation of deferred tax asset for current year net operating loss due to tax rate change                   4,134 0 0
Permanent differences including section 162(m) limitations, stock compensation, gain on foreign restructuring, and meals & entertainment                   5,141 1,292 636
Tax benefit of federal R&D credit                   (2,366) (1,781) (1,270)
Recognition of excess tax benefits related to share-based payments                   (3,606) 0 0
Valuation allowance                   (8,586) 17,013 17,697
Other                   (206) 261 (45)
Total income tax provision $ (6) $ 25 $ 33 $ 9 $ 1 $ (8) $ 12 $ 19   $ 61 $ 24 $ (7)
Taxable gain for restructuring of foreign operations                 $ 13,900