Schedule of Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Accruals and reserves	$ 4,348	$ 1,144
Share-based compensation expense	2,532	2,366
Development costs		5
Alternative minimum tax credit carryforward	1,483	1,468
General business credit carryforward	1,126	481
State tax credits	5,500	5,500
Net operating loss carryforwards	17,350	28,025
Other	701	1,065
Deferred tax assets, gross	33,040	40,054
Valuation allowances	(6,983)	(18,109)
Deferred tax assets	26,057	21,945
Deferred tax liabilities:
Prepaid services	(884)	(1,034)
Amortization of intangible assets	(14,304)	(20,024)
Depreciation of fixed assets	(3,082)	(925)
Deferred tax liabilities, gross	(18,270)	(21,983)
Net deferred tax assets (liabilities)	$ 7,787
Net deferred tax assets (liabilities)		$ (38)