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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2020
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit)
Income tax expense (benefit) for the years ended December 31, 2020 and 2019 attributable to loss from operations is presented below.
CurrentDeferredTotal
Year ended December 31, 2020
Federal$240 $— $240 
State— — — 
Foreign321 (387)(66)
$561 $(387)$174 
Year ended December 31, 2019
Federal$(196)$(4,741)$(4,937)
State(28)(29)(57)
Foreign1,143 (152)991 
$919 $(4,922)$(4,003)
Schedule of Effective Income Tax Rate Reconciliation
Actual income tax expense (benefit) differs from the “expected” income tax expense (benefit) computed by applying the United States Federal statutory income tax rate of 21% for both 2020 and 2019 to loss before tax expense, as follows:
 Year Ended December 31,
 20202019
Income tax benefit at Federal statutory income tax rate
$(4,571)$(4,203)
Increase (decrease) in income taxes resulting from:
State income tax benefit, net of federal benefit(600)(610)
State research and development, investment credits(213)71 
Non-deductible meals & entertainment22 36 
Non-deductible stock compensation expense19 18 
Foreign tax rate differential235 (4)
Federal research and development credits(707)(490)
Uncertain tax positions39 (110)
Provision to tax return adjustments144 21 
Change in valuation allowance3,980 934 
Loss on legal entity dissolution— 244 
Impairment of goodwill and intangibles1,834 — 
Other(8)90 
     Income tax expense (benefit)$174 $(4,003)
Schedule of Loss before Income Tax, Domestic and Foreign
Loss from continuing operations before income tax expense (benefit) determined by tax jurisdiction, are as follows:
 Year Ended December 31,
 20202019
United States$(11,862)$(22,452)
Foreign(9,904)2,440 
Total$(21,766)$(20,012)
Schedule of Deferred Tax Assets and Liabilities
Deferred tax assets and liabilities for the periods presented consisted of the following:
 December 31,
 20202019
Deferred tax assets:
Accounts receivable, due to allowance for doubtful accounts$221 $373 
Inventories1,209 776 
Operating loss carry-forwards2,744 1,343 
Stock-based compensation expense874 807 
Property and equipment, due to difference in depreciation841 47 
Research and development tax credit carry-forwards5,640 5,243 
Foreign tax credit carry-forwards2,345 2,345 
State tax credit carry-forwards3,838 3,146 
Capitalized research and development3,154 3,263 
Warranty reserve429 523 
Accrued expenses1,216 845 
Lease liability1,574 1,378 
Gross deferred tax assets24,085 20,089 
Less valuation allowance(22,432)(18,452)
Total deferred tax assets1,653 1,637 
Deferred tax liabilities:
Purchased intangible assets(384)(844)
Property and equipment, due to differences in depreciation(50)(132)
Right of use asset(1,564)(1,378)
Total deferred tax liabilities(1,998)(2,354)
Net deferred tax liability$(345)$(717)
Deferred income tax asset$73 $45 
Deferred income tax liability$(418)$(762)
Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block]
The aggregate changes in the total gross amount of unrecognized tax benefits are as follows:
 Year Ended December 31,
 20202019
Unrecognized tax benefits as of January 1$1,897 $494 
Gross (decrease) increase in unrecognized tax benefits - prior year tax positions(105)1,524 
Gross increase in unrecognized tax benefits - current year tax positions— 78 
Lapse of statute of limitations(21)(199)
Unrecognized tax benefits as of December 31$1,771 $1,897