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Income Tax - Reconciliation of Income Tax Attributable to Operations (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Income taxes at statutory rates (at a rate of 21% for 2018 and 34% for 2017 and 2016) | $ (2,664) | $ (4,636) | $ (504)
Expenses not deducted for tax purposes | 70 | (174) |
Effect of tax rate changes on deferred tax assets and liabilities | (1,416) | 3,158 |
Rate differential on foreign earnings | (165) | 314 |
Change in valuation allowance | 4,182 | (1,683) |
Book to tax return adjustments | 20 |  |
Other | $ (27) | (14) |
Income tax expense |  | $ (3,035) | $ (504)

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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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