Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Deferred tax assets, valuation allowance	$ 40,857	$ 40,857	$ 33,774
Tax Credit Carryforward, Amount	13,571	13,571	11,454
Research and development credits	4,530	4,530	3,320
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	188,000	188,000
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	5,800	5,800
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	88,700	88,700
Unrecognized Tax Benefits	12,580	12,580	$ 28,673	$ 30,164
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	8,100	8,100
Decrease in Unrecognized Tax Benefits is Reasonably Possible	3,200	3,200
Unrecognized Tax Benefits, Income Tax Penalties Accrued	4,100	4,100
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	6,800	6,800
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit)		(8,100)
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Deferred Tax Liability, Provisional Income Tax (Expense) Benefit		(9,400)
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Repatriation of Earnings of Foreign Subsidiary, Provisional Income Tax Expense (Benefit)		1,900
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Tax Credits, Foreign		2,800
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Tax Effect, Increase (Decrease) in Valuation Allowance		16,600
Tax Cuts and Jobs Act of 2017, Measurement Period Adjustment, Repatriation of Earnings of Foreign Subsidiary, Provisional Income Tax Expense (Benefit)	300
Tax Cuts And Jobs Act Of 2017 Measurement Period Adjustment Transition Tax For Accumulated Foreign Earnings Provisional Income Tax Expense Benefit	200
Tax Cuts and Jobs Act of 2017 Measurement Period Adjustment Change In Tax Rate Foreign Tax Credit Carryforward Provisional Valuation Allowance	100
Cadillac Jack [Member]
Operating Loss Carryforwards [Line Items]
Business Combination, Indemnification Assets	$ 9,300	$ 9,300