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Schedule of Deferred Tax Assets (Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Accruals and reserves $ 3,854 $ 1,571
Share-based compensation expense 3,758 2,532
Alternative minimum tax credit carryforward 741 1,483
General business credit carryforward 2,447 1,126
State tax credits 5,500 5,500
Net operating loss carryforwards 19,156 17,350
Other 944 701
Deferred tax assets, gross 36,400 30,263
Valuation allowances (23,276) (6,983)
Deferred tax assets 13,124 23,280
Deferred tax liabilities:    
Prepaid services (876) (884)
Amortization of intangible assets (9,519) (11,527)
Depreciation of fixed assets (5,322) (3,082)
Deferred tax liabilities, gross (15,717) (15,493)
Net deferred tax liabilities $ (2,593)  
Net deferred tax assets   $ 7,787