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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Net operating loss carryforwards $ 9,250 $ 7,239
State income taxes 65 159
Accruals and allowances 287 447
Stock based compensation 744 771
Unrealized foreign exchange losses 191 149
Deferred revenue 87 113
Deferred rent 418 625
Total deferred tax assets 11,042 9,503
Valuation allowance (9,249) (7,168)
Total deferred tax assets net of valuation allowance 1,793 2,335
Deferred tax liabilities:    
U.S. tax on undistributed earnings 0 (173)
Property, equipment and intangible assets (277) (351)
Total deferred tax liabilities (277) (524)
Net deferred tax assets $ 1,516 $ 1,811