Income Taxes - Schedule of Income Tax Expense (Benefit) Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Tax benefit at U.S. federal statutory income tax rate on income or loss subject to tax	$ (17,857)	$ (21,085)	$ (4,581)
State income tax expense, net of federal tax	(1,313)	(1,222)	6,081
Gross receipts and margin taxes	1,580	1,716	1,847
Foreign rate differential	301	632	647
Effect of permanent differences	(34)	6	(280)
Return to provision adjustments	(278)	1,597	287
Remeasurement of deferred tax assets and liabilities	0	17,080	0
Increase (decrease) in valuation allowance	(253)	(57)	472
Total income tax expense (benefit)	$ (17,854)	$ (1,333)	$ 4,473