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Income Tax - Income tax reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Effective Tax Rate Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |
Computed "Expected" Income Tax Expense |  |  |  |  |  |  |  |  | $ (1,674) | $ (892)
Permanent differences, net |  |  |  |  |  |  |  |  | (117) | (118)
Foreign tax rate differential |  |  |  |  |  |  |  |  | (11) | 23
State income taxes, net of federal income tax benefit |  |  |  |  |  |  |  |  | (121) | (103)
Non-deductible stock compensation expense |  |  |  |  |  |  |  |  | (329) | 174
Acquisition costs |  |  |  |  |  |  |  |  | 438 | 0
Impact Of Foreign Rate Changes |  |  |  |  |  |  |  |  | 0 | 3,159
Tax credits |  |  |  |  |  |  |  |  | (242) | (14)
Change in reserve for uncertain tax position |  |  |  |  |  |  |  |  | 203 | (58)
Impact of change to prior year tax accruals |  |  |  |  |  |  |  |  | 100 | 72
Impact of adoption of ASU 2016-09 |  |  |  |  |  |  |  |  | 0 | (486)
U.S tax on foreign dividends |  |  |  |  |  |  |  |  | 0 | 3,149
Foreign withholding taxes |  |  |  |  |  |  |  |  | 0 | 38
Conversion of U.S foreign tax credits from credit to deduction |  |  |  |  |  |  |  |  | 0 | 648
Change in valuation allowance allocated to income tax expense (benefit) |  |  |  |  |  |  |  |  | (1,850) | (6,152)
Other |  |  |  |  |  |  |  |  | (73) | (45)
Income Tax Expense, Total | $ (3,260) | $ (652) | $ (369) | $ 605 | $ (464) | $ (19) | $ (115) | $ (7) | $ (3,676) | $ (605)

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- Definition The portion of the difference, between total income tax expense (benefit) as reported in the Income Statement for the period and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, that is attributable to deduction for foreign tax credit. + References No definition available. + Details
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- Definition The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10(c)(3)(ii)(A)) -URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862 + Details
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