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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
NOL carryforwards | $ 15,337 | $ 23,291
UK NOL carryforwards | 567 | 516
Allowance for doubtful accounts | 119 | 139
Compensation and vacation accrual | 64 | 92
Operating accruals | 47 | 147
Research and experimentation, AMT and foreign tax credits | 148 | 147
Texas Margin Tax Credit | 136 | 126
Fixed assets and intangibles | (220) | 199
Other | 514 | 664
Total gross deferred tax assets | 16,712 | 25,321
Valuation allowance | (16,340) | (24,880)
Net deferred tax assets | 372 | 441
Capitalized software | 375 | 359
Foreign | 49 | 45
Deferred revenue |  | 49
Total gross deferred liabilities | 424 | 453
Net deferred taxes | $ (52) | $ (12)

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