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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)

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