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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Schedule of Pre-Tax Income (Loss) | In 2017, 2016 and 2015, pre-tax income (loss) was attributed to the following jurisdictions:
| Year Ended December 31,
(In thousands) | 2017 |  | 2016 |  | 2015
Domestic operations | $ | (12,852 | ) |  | $ | 165 |  |  | $ | (6,857 | )
Foreign operations | 20,140 |  |  | 25,023 |  |  | 42,832 |
Total | $ | 7,288 |  |  | $ | 25,188 |  |  | $ | 35,975 |
Schedule of Components of Income Tax Expense (Benefit) | The provision for income taxes charged to operations was as follows:
| Year Ended December 31,
(In thousands) | 2017 |  | 2016 |  | 2015
Current tax expense: |  |  |  |  |
U.S. federal | $ | 3,406 |  |  | $ | 1,748 |  |  | $ | 2,726 |
State and local | 72 |  |  | 374 |  |  | 189 |
Foreign | 8,304 |  |  | 4,150 |  |  | 9,028 |
Total current | 11,782 |  |  | 6,272 |  |  | 11,943 |
Deferred tax (benefit) expense: |  |  |  |  |
U.S. federal | 9,495 |  |  | (1,416 | ) |  | (4,588 | )
State and local | (369 | ) |  | (356 | ) |  | (87 | )
Foreign | (3,297 | ) |  | 304 |  |  | (466 | )
Total deferred | 5,829 |  |  | (1,468 | ) |  | (5,141 | )
Total provision for income taxes | $ | 17,611 |  |  | $ | 4,804 |  |  | $ | 6,802 |
Schedule of Deferred Tax Assets and Liabilities | Net deferred tax assets were comprised of the following:
| December 31,
(In thousands) | 2017 |  | 2016
Deferred tax assets: |  |  |
Inventory reserves | $ | 1,104 |  |  | $ | 1,396 |
Capitalized research costs | 23 |  |  | 44 |
Capitalized inventory costs | 609 |  |  | 704 |
Net operating losses | 999 |  |  | 485 |
Acquired intangible assets | 287 |  |  | 136 |
Accrued liabilities | 1,239 |  |  | 4,739 |
Income tax credits | 8,861 |  |  | 12,509 |
Stock-based compensation | 2,712 |  |  | 3,376 |
Amortization of intangible assets | 526 |  |  | — |
Total deferred tax assets | 16,360 |  |  | 23,389 |
Deferred tax liabilities: |  |  |
Depreciation | (944 | ) |  | (2,924 | )
Allowance for doubtful accounts | (444 | ) |  | (241 | )
Amortization of intangible assets | — |  |  | (780 | )
Other | (2,680 | ) |  | (1,479 | )
Total deferred tax liabilities | (4,068 | ) |  | (5,424 | )
Net deferred tax assets before valuation allowance | 12,292 |  |  | 17,965 |
Less: Valuation allowance | (8,802 | ) |  | (8,635 | )
Net deferred tax assets | $ | 3,490 |  |  | $ | 9,330 |
Schedule of Effective Income Tax Rate Reconciliation | The provision for income taxes differs from the amount of income tax determined by applying the applicable U.S. statutory federal income tax rate to pre-tax income from operations as a result of the following:
| Year Ended December 31,
(In thousands) | 2017 |  | 2016 |  | 2015
Tax provision at statutory U.S. rate | $ | 2,551 |  |  | $ | 8,554 |  |  | $ | 12,232 |
Increase (decrease) in tax provision resulting from: |  |  |  |  |
State and local taxes, net | (733 | ) |  | (553 | ) |  | (554 | )
Foreign tax rate differential | (296 | ) |  | (3,244 | ) |  | (5,762 | )
Foreign undistributed earnings, net of credits | 14,211 |  |  | — |  |  | — |
Nondeductible items | 891 |  |  | 839 |  |  | 874 |
Federal research and development credits | (620 | ) |  | (710 | ) |  | (678 | )
Non-territorial income | (1,517 | ) |  | (1,458 | ) |  | (1,906 | )
Withholding tax | 1,078 |  |  | 1,762 |  |  | 1,985 |
Change in deductibility of social insurance | 5 |  |  | 8 |  |  | 649 |
Uncertain tax positions | 1,344 |  |  | 165 |  |  | 10 |
Stock-based compensation | 479 |  |  | — |  |  | — |
Federal tax rate change | 686 |  |  | — |  |  | — |
Valuation allowance | 149 |  |  | 1,598 |  |  | 621 |
Foreign permanent benefit | (451 | ) |  | (2,110 | ) |  | (675 | )
Other | (166 | ) |  | (47 | ) |  | 6 |
Tax provision | $ | 17,611 |  |  | $ | 4,804 |  |  | $ | 6,802 |
Schedule of Unrecognized Tax Benefits Roll Forward | Changes to our gross unrecognized tax benefits were as follows:
| Year ended December 31,
(In thousands) | 2017 |  | 2016 |  | 2015
Balance at beginning of period | $ | 3,622 |  |  | $ | 3,469 |  |  | $ | 3,486 |
Additions as a result of tax provisions taken during the current year | 1,489 |  |  | 305 |  |  | 463 |
Subtractions as a result of tax provisions taken during the prior year | — |  |  | — |  |  | (161 | )
Foreign currency translation | 90 |  |  | (93 | ) |  | (79 | )
Lapse in statute of limitations | (141 | ) |  | (67 | ) |  | (241 | )
Settlements | — |  |  | — |  |  | — |
Other | 21 |  |  | 8 |  |  | 1 |
Balance at end of period | $ | 5,081 |  |  | $ | 3,622 |  |  | $ | 3,469 |

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