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Income Taxes - Summary of deferred tax liabilities (assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax liabilities: |  |
Software development costs | $ 2,119 | $ 2,223
Acquired intangible assets | 913 | 1,731
Gross deferred tax liabilities | 3,032 | 3,954
Allowances for bad debts and inventory | (2,958) | (4,505)
Capitalized inventory costs | (109) | (104)
Intangible assets | (672) | (1,388)
Employee benefit accruals | (1,282) | (2,089)
Federal net operating loss carryforward | (4,941) | (5,820)
State net operating loss carryforward | (1,540) | (1,085)
Tax credit carryforwards | (6,064) | (6,888)
Foreign currency | (33) | (33)
Other | (895) | (1,333)
Gross deferred tax assets | (18,494) | (23,245)
Less valuation allowance | 1,653 | 1,874
Net deferred tax assets | $ (13,809) | $ (17,417)

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