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Income Taxes - Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Increase (decrease) in income taxes resulting from: |  |  |
Income tax benefit at Federal statutory income tax rate | $ (1,611) | $ (3,379) | $ (670)
State income tax expense, net of federal benefit | 172 | 56 | (156)
State research and development, investment credits | (397) | (435) | (363)
Non-deductible meals & entertainment | 28 | 47 | 49
Non-deductible stock compensation expense | 21 | 338 | 216
Non-deductible transaction costs | 0 | 0 | 116
Subpart F income, net of foreign tax credits | 0 | 1,171 | 523
GILTI | 577 | 0 | 0
Foreign branch income | 0 | 0 | 52
Nontaxable interest income | 2 | 0 | (162)
Foreign tax rate differential | (93) | (902) | (1,258)
Federal research and development credits | (378) | (427) | (395)
Uncertain tax positions | (209) | 189 | 283
Provision to tax return adjustments | 470 | 8 | (95)
Change in tax rates | (3) | 926 | 14
Change in valuation allowance | 2,130 | 3,330 | 7,425
Foreign research and development incentives | (32) | (22) | (45)
Other | (112) | 196 | 13
Income tax expense | $ 565 | $ 1,096 | $ 5,547

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318 + Details
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