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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Taxes |
Schedule of income before income taxes |
|  | Year ended December 31, |
|  | 2019 |  | 2018 |  | 2017 |
|  | (in thousands) |
United States |  | $ | 18,148 |  | $ | 52,172 |  | $ | 40,752 |
Foreign |  |  | 2,774 |  |  | 2,533 |  |  | 3,079 |
Income before income taxes |  | $ | 20,922 |  | $ | 54,705 |  | $ | 43,831 |
Schedule of provision for income taxes |
|  | Year ended December 31, |
|  | 2019 |  | 2018 |  | 2017 |
|  | (in thousands) |
Current: |  |  |  |  |  |  |  |  |  |
United States |  |  |  |  |  |  |  |  |  |
Federal |  | $ | — |  | $ | 41 |  | $ | 430 |
State |  |  | 5 |  |  | 112 |  |  | 32 |
Foreign |  |  | 579 |  |  | 323 |  |  | 230 |
Total current |  |  | 584 |  |  | 476 |  |  | 692 |
Deferred: |  |  |  |  |  |  |  |  |  |
Federal |  |  | 3,962 |  |  | 8,108 |  |  | (82,048) |
State |  |  | (855) |  |  | 425 |  |  | (1,698) |
Foreign |  |  | 197 |  |  | (189) |  |  | (74) |
Total deferred |  |  | 3,304 |  |  | 8,344 |  |  | (83,820) |
Income tax provision (benefit) |  | $ | 3,888 |  | $ | 8,820 |  | $ | (83,128) |
Schedule of reconciliation of income taxes at the United States Federal statutory rate to the effective income tax rate |
|  | Year ended December 31, |
|  | 2019 |  | 2018 |  | 2017 |
|  | (in thousands) |
Income taxes at the United States statutory rate |  | $ | 4,393 |  | $ | 11,488 |  | $ | 15,341 |
State income taxes |  |  | 78 |  |  | 299 |  |  | 203 |
Unrecognized tax benefits |  |  | (251) |  |  | (345) |  |  | (285) |
Effect of change in valuation allowance |  |  | 1,492 |  |  | (441) |  |  | (115,831) |
Foreign income tax rate differentials |  |  | 129 |  |  | 73 |  |  | (312) |
Unremitted earnings of foreign subsidiaries |  |  | — |  |  | — |  |  | (8,933) |
Stock options |  |  | (1,257) |  |  | (715) |  |  | (10,342) |
Credit expirations |  |  | 894 |  |  | — |  |  | — |
Repatriation of foreign earnings |  |  | — |  |  | — |  |  | 4,556 |
Recognition of equity NOL's |  |  | — |  |  | — |  |  | (1,165) |
Rate change |  |  | 194 |  |  | 160 |  |  | 42,531 |
Credit generation |  |  | (3,124) |  |  | (3,530) |  |  | (8,778) |
Discrete items, net |  |  | 18 |  |  | 972 |  |  | 31 |
Other, net |  |  | 1,322 |  |  | 859 |  |  | (144) |
Income tax provision (benefit) |  | $ | 3,888 |  | $ | 8,820 |  | $ | (83,128) |
Schedule of significant components of current and long-term deferred income taxes |
|  | Year ended December 31, |
|  | 2019 |  | 2018 |
|  | (in thousands) |
Deferred tax assets: |  |  |
Federal net operating loss carryforwards |  | $ | 39,380 |  | $ | 42,397 |
State net operating loss carryforwards |  |  | 1,211 |  |  | 1,387 |
Foreign net operating loss carryforwards |  |  | 554 |  |  | 641 |
Federal tax credit carryforwards |  |  | 18,061 |  |  | 16,200 |
State tax credit carryforwards |  |  | 6,837 |  |  | 6,489 |
Property, plant and equipment |  |  | 10,098 |  |  | 5,924 |
Operating lease liability |  |  | 503 |  |  | — |
Accrued compensation |  |  | 266 |  |  | 97 |
Inventories |  |  | 2,674 |  |  | 3,713 |
Stock compensation |  |  | 2,477 |  |  | 2,760 |
Warranty |  |  | 689 |  |  | 1,090 |
Deferred revenue |  |  | 1,086 |  |  | 1,004 |
Gross deferred tax assets |  |  | 83,836 |  |  | 81,702 |
Valuation allowance |  |  | (8,327) |  |  | (6,835) |
Net deferred tax assets |  |  | 75,509 |  |  | 74,867 |
Deferred tax liabilities: |  |  |  |  |  |  |
Intangible assets |  |  | (47) |  |  | (29) |
Right-of-use asset |  |  | (5,141) |  |  | — |
Internal Revenue Code 481(a) adjustment |  |  | (412) |  |  | — |
Other |  |  | (1,849) |  |  | (2,899) |
Gross deferred tax liabilities |  |  | (7,449) |  |  | (2,928) |
Deferred taxes, net |  | $ | 68,060 |  | $ | 71,939 |
Schedule of reconciliation of the beginning and ending balance of unrecognized tax benefits |
|  |  | Year ended December 31, |
|  | 2019 |  | 2018 |  | 2017 |
|  | (in thousands) |
Balance at beginning of year |  | $ | 9,127 |  | $ | 9,105 |  | $ | 6,844 |
Increase / (decrease) in unrecognized tax benefits as a result of tax positions taken during a prior period |  |  | 215 |  |  | (132) |  |  | 81 |
Reductions to unrecognized tax benefits as a result of a lapse of the applicable statute of limitation |  |  | (334) |  |  | (543) |  |  | (511) |
Increases in unrecognized tax benefits as a result of tax positions taken during the current period |  |  | 791 |  |  | 697 |  |  | 2,691 |
Balance at end of year |  | $ | 9,799 |  | $ | 9,127 |  | $ | 9,105 |
Recorded as other long-term liability |  | $ | 409 |  | $ | 676 |  | $ | 1,109 |
Recorded as a decrease in deferred tax assets and offsetting valuation allowance |  |  | 9,390 |  |  | 8,451 |  |  | 7,996 |
Balance at end of year |  | $ | 9,799 |  | $ | 9,127 |  | $ | 9,105 |

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