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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Schedule of Income before Income Tax, Domestic and Foreign | For the years ended December 31, 2018, 2017 and 2016, income before income taxes is broken out between U.S. and foreign-sourced operations and consisted of the following (in thousands):
| 2018 |  | 2017 |  | 2016
Domestic | $ | 21,084 |  |  | $ | 14,531 |  |  | $ | 6,174 |
Foreign | 28,435 |  |  | 21,350 |  |  | 19,212 |
Total | $ | 49,519 |  |  | $ | 35,881 |  |  | $ | 25,386 |
Schedule of Components of Income Tax Expense (Benefit) | The components of the provision for income taxes for the years ended December 31, 2018, 2017 and 2016, consisted of the following (in thousands):
| 2018 |  | 2017 |  | 2016
Current expense (benefit): |  |  |  |  |  |  |  |
Federal | $ | (1,132 | ) |  | $ | 3,849 |  |  | $ | 1,933 |
State | 582 |  |  | 645 |  |  | 492 |
Foreign | 6,000 |  |  | 5,168 |  |  | 3,802 |
Total current expense | 5,450 |  |  | 9,662 |  |  | 6,227 |
Deferred expense (benefit): |  |  |  |  |  |  |  |
Federal | 4,400 |  |  | (314 | ) |  | (144 | )
State | (667 | ) |  | (216 | ) |  | (195 | )
Foreign | (1,681 | ) |  | (774 | ) |  | (623 | )
Total deferred (benefit) expense | 2,052 |  |  | (1,304 | ) |  | (962 | )
Total income tax expense | $ | 7,502 |  |  | $ | 8,358 |  |  | $ | 5,265 |
Schedule of Effective Income Tax Rate Reconciliation | The difference between the income tax expense reported and amounts computed by applying the statutory federal rate of 21.0% to pretax income for the year ended December 31, 2018, and 35% for years ended December 31, 2017 and 2016, consisted of the following (in thousands):
| 2018 |  | 2017 |  | 2016
Computed federal income tax expense at applicable statutory rate | $ | 10,399 |  |  | $ | 12,559 |  |  | $ | 8,885 |
State income taxes | (59 | ) |  | 279 |  |  | 193 |
Tax credits | (1,734 | ) |  | (1,377 | ) |  | (1,164 | )
Production activity deduction | — |  |  | — |  |  | (53 | )
Foreign tax rate differential | (1,361 | ) |  | (3,329 | ) |  | (3,717 | )
Uncertain tax positions | 267 |  |  | (19 | ) |  | 597 |
Deferred compensation insurance assets | 186 |  |  | (479 | ) |  | (307 | )
Transaction-related expenses | 223 |  |  | 90 |  |  | 274 |
U.S. transition tax | (3,271 | ) |  | 10,612 |  |  | — |
TCJA remeasurement of deferred taxes | (71 | ) |  | (8,383 | ) |  | — |
Stock-based payments | (4,278 | ) |  | (2,264 | ) |  | — |
Bargain purchase gain | — |  |  | (1,570 | ) |  | — |
In-process research and development | — |  |  | 1,486 |  |  | — |
Net GILTI | 347 |  |  | — |  |  | — |
Foreign withholding tax | 5,590 |  |  | — |  |  | — |
Other — including the effect of graduated rates | 1,264 |  |  | 753 |  |  | 557 |
Total income tax expense | $ | 7,502 |  |  | $ | 8,358 |  |  | $ | 5,265 |
Schedule of Deferred Tax Assets and Liabilities | Deferred income tax assets and liabilities at December 31, 2018 and 2017, consisted of the following temporary differences and carry-forward items (in thousands):
| 2018 |  | 2017
Deferred income tax assets: |  |  |  |
Allowance for uncollectible accounts receivable | $ | 606 |  |  | $ | 467 |
Accrued compensation expense | 7,414 |  |  | 5,154 |
Inventory differences | 1,269 |  |  | 2,505 |
Net operating loss carryforwards | 20,226 |  |  | 15,741 |
Deferred revenue | 46 |  |  | 58 |
Stock-based compensation expense | 2,833 |  |  | 2,281 |
Other | 9,243 |  |  | 8,986 |
Total deferred income tax assets | 41,637 |  |  | 35,192 |
Deferred income tax liabilities: |  |  |  |  |
Prepaid expenses | (1,142 | ) |  | (930 | )
Property and equipment | (20,045 | ) |  | (20,352 | )
Intangible assets | (58,883 | ) |  | (28,588 | )
Foreign withholding tax | (5,590 | ) |  | — |
Other | (4,350 | ) |  | (1,830 | )
Total deferred income tax liabilities | (90,010 | ) |  | (51,700 | )
Valuation allowance | (4,989 | ) |  | (4,422 | )
Net deferred income tax assets (liabilities) | $ | (53,362 | ) |  | $ | (20,930 | )
Reported as: |  |  |
Deferred income tax assets - Long-term | $ | 3,001 |  |  | $ | 2,359 |
Deferred income tax liabilities - Long-term | (56,363 | ) |  | (23,289 | )
Net deferred income tax liabilities | $ | (53,362 | ) |  | $ | (20,930 | )
Summary of Income Tax Contingencies | A reconciliation of the beginning and ending amount of liabilities associated with uncertain tax benefits for the years ended December 31, 2018, 2017 and 2016, consisted of the following (in thousands):
Tabular Roll-forward |  | 2018 |  | 2017 |  | 2016
Unrecognized tax benefits, opening balance |  | $ | 2,749 |  |  | $ | 2,549 |  |  | $ | 1,982 |
Gross increases in tax positions taken in a prior year |  | 35 |  |  | 80 |  |  | 77 |
Gross increases in tax positions taken in the current year |  | 586 |  |  | 403 |  |  | 856 |
Lapse of applicable statute of limitations |  | (423 | ) |  | (283 | ) |  | (366 | )
Unrecognized tax benefits, ending balance |  | $ | 2,947 |  |  | $ | 2,749 |  |  | $ | 2,549 |

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