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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)