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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Net operating loss carryforwards $ 9,805 $ 9,250
State income taxes 82 65
Accruals and allowances 292 287
Stock based compensation 910 744
Unrealized foreign exchange losses 151 191
Deferred revenue 377 87
Deferred rent 0 418
Total deferred tax assets 11,617 11,042
Valuation allowance (9,723) (9,249)
Total deferred tax assets net of valuation allowance 1,894 1,793
Deferred tax liabilities:    
Deferred rent (80) 0
Property, equipment and intangible assets (169) (277)
Total deferred tax liabilities (249) (277)
Net deferred tax assets $ 1,645 $ 1,516