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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Schedule of Provision for Income Taxes | The provision (benefit) for income taxes for the years ended December 31, 2020, 2019 and 2018 consists of the following:
| 2020 |  | 2019 |  | 2018
Current tax expense (benefit): |  |  |  |  |
Federal | $ | (729) |  |  | $ | 96 |  |  | $ | (1,077) |
State | 86 |  |  | 444 |  |  | 777 |
Foreign | 6,963 |  |  | 8,375 |  |  | 8,036 |
| 6,320 |  |  | 8,915 |  |  | 7,736 |
Deferred income tax expense (benefit): |  |  |  |  |
Federal | (12,253) |  |  | (3,970) |  |  | 4,478 |
State | (1,173) |  |  | (938) |  |  | 62 |
Foreign | (808) |  |  | (1,402) |  |  | (2,477) |
| (14,234) |  |  | (6,310) |  |  | 2,063 |
Provision (benefit) for income taxes | $ | (7,914) |  |  | $ | 2,605 |  |  | $ | 9,799 |
Schedule of Effective Income Tax Rate Reconciliation | A reconciliation between income taxes computed at the statutory federal rate and the provision (benefit) for income taxes for the years ended December 31, 2020, 2019 and 2018 follows:
| 2020 |  | 2019 |  | 2018
Tax provision at statutory rate based on income before income taxes | 21.0 | % |  | 21.0 | % |  | 21.0 | %
Stock-based compensation | (267.7) |  |  | (15.4) |  |  | (1.6) |
Settlement of taxing authority examinations | (122.9) |  |  | (7.7) |  |  | (0.7) |
Federal research credit | (124.2) |  |  | (4.0) |  |  | (2.8) |
Tax treaty protocols | — |  |  | (2.9) |  |  | — |
US tax on worldwide earnings at different rates | (123.7) |  |  | 7.9 |  |  | 2.9 |
Foreign income taxes | 129.6 |  |  | 6.4 |  |  | 3.6 |
Non deductible/non-taxable items | 28.6 |  |  | 2.8 |  |  | (1.4) |
State income taxes, net of federal tax benefit | (24.5) |  |  | 0.3 |  |  | 1.6 |
International tax reform | — |  |  | — |  |  | (3.6) |
US tax reform | — |  |  | — |  |  | 1.8 |
Other, net | (10.1) |  |  | (0.1) |  |  | (1.5) |
| (493.9) | % |  | 8.3 | % |  | 19.3 | %
Schedule of Deferred Tax Assets and Liabilities | The tax effects of the significant temporary differences which comprise the deferred income tax assets and liabilities at December 31, 2020 and 2019 are as follows:
| 2020 |  | 2019
Assets: |  |  |
Inventory | $ | 4,649 |  |  | $ | 4,085 |
Net operating losses | 22,197 |  |  | 3,679 |
Capitalized research and development | 5,187 |  |  | 6,201 |
Deferred compensation | 2,240 |  |  | 2,102 |
Accounts receivable | 2,784 |  |  | 2,556 |
Compensation and benefits | 7,540 |  |  | 6,049 |
Accrued pension | 5,348 |  |  | 3,710 |
Research and development credit | 13,540 |  |  | 10,321 |
Interest limitation | — |  |  | 5,702 |
Convertible notes hedge | 6,999 |  |  | 9,004 |
Lease liabilities | 4,452 |  |  | 5,688 |
Other | 6,793 |  |  | 4,336 |
Less: valuation allowances | (2,721) |  |  | (1,732) |
| 79,008 |  |  | 61,701 |
Liabilities: |  |  |
Goodwill and intangible assets | 104,119 |  |  | 102,015 |
Depreciation | 2,512 |  |  | 301 |
State taxes | 9,614 |  |  | 11,161 |
Unremitted foreign earnings | 2,423 |  |  | 2,619 |
Convertible notes debt discount | 7,060 |  |  | 9,096 |
Lease right-of-use assets | 4,313 |  |  | 5,338 |
| 130,041 |  |  | 130,530 |
Net liability | $ | (51,033) |  |  | $ | (68,829) |
Schedule of Income before Income Tax | Income before income taxes consists of the following U.S. and foreign income:
| 2020 |  | 2019 |  | 2018
U.S. income | $ | (16,026) |  |  | $ | 5,332 |  |  | $ | 24,320 |
Foreign income | 17,629 |  |  | 25,893 |  |  | 26,333 |
Total income | $ | 1,603 |  |  | $ | 31,225 |  |  | $ | 50,653 |
Schedule of Unrecognized Tax Benefits Rollforward | The following table summarizes the activity related to our unrecognized tax benefits for the years ending December 31,:
| 2020 |  | 2019 |  | 2018
Balance as of January 1, | $ | 2,170 |  |  | $ | 3,073 |  |  | $ | 2,943 |
Increases (decreases) for positions taken in prior periods | — |  |  | — |  |  | (250) |
Increases for positions taken in current periods | — |  |  | 1,650 |  |  | 1,017 |
Decreases in unrecorded tax positions related to settlement with the taxing authorities | (1,970) |  |  | (2,404) |  |  | (370) |
Decreases in unrecorded tax positions related to lapse of statute of limitations | — |  |  | (149) |  |  | (267) |
Balance as of December 31, | $ | 200 |  |  | $ | 2,170 |  |  | $ | 3,073 |

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