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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Income Taxes |
Schedule of income before income taxes |
|  | Year ended December 31, |
|  | 2018 |  | 2017 |  | 2016 |
|  | (in thousands) |
United States |  | $ | 52,172 |  | $ | 40,752 |  | $ | 8,880 |
Foreign |  |  | 2,533 |  |  | 3,079 |  |  | 2,144 |
Income before income taxes |  | $ | 54,705 |  | $ | 43,831 |  | $ | 11,024 |
Schedule of provision for income taxes |
|  | Year ended December 31, |
|  | 2018 |  | 2017 |  | 2016 |
|  | (in thousands) |
Current: |  |  |  |  |  |  |  |  |  |
United States |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 41 |  | $ | 430 |  | $ | — |
State |  |  | 112 |  |  | 32 |  |  | 49 |
Foreign |  |  | 323 |  |  | 230 |  |  | (217) |
Total current |  |  | 476 |  |  | 692 |  |  | (168) |
Deferred: |  |  |  |  |  |  |  |  |  |
Federal |  |  | 8,108 |  |  | (82,048) |  |  | — |
State |  |  | 425 |  |  | (1,698) |  |  | — |
Foreign |  |  | (189) |  |  | (74) |  |  | 191 |
Total deferred |  |  | 8,344 |  |  | (83,820) |  |  | 191 |
Income tax provision (benefit) |  | $ | 8,820 |  | $ | (83,128) |  | $ | 23 |
Schedule of reconciliation of income taxes at the United States Federal statutory rate to the effective income tax rate |
|  | Year ended December 31, |
|  | 2018 |  | 2017 |  | 2016 |
|  | (in thousands) |
Income taxes at the United States statutory rate |  | $ | 11,488 |  | $ | 15,341 |  | $ | 3,859 |
State income taxes |  |  | 299 |  |  | 203 |  |  | 32 |
Unrecognized tax benefits |  |  | (345) |  |  | (285) |  |  | (615) |
Effect of change in valuation allowance |  |  | (441) |  |  | (115,831) |  |  | (7,765) |
Foreign income tax rate differentials |  |  | 73 |  |  | (312) |  |  | 233 |
Unremitted earnings of foreign subsidiaries |  |  | — |  |  | (8,933) |  |  | 305 |
Stock options |  |  | (715) |  |  | (10,342) |  |  | 264 |
Credit expirations |  |  | — |  |  | — |  |  | 3,565 |
Repatriation of foreign earnings |  |  | — |  |  | 4,556 |  |  | — |
Recognition of equity NOL's |  |  | — |  |  | (1,165) |  |  | — |
Rate change |  |  | 160 |  |  | 42,531 |  |  | — |
Credit generation |  |  | (3,530) |  |  | (8,778) |  |  | — |
Discrete items, net |  |  | 972 |  |  | 31 |  |  | — |
Other, net |  |  | 859 |  |  | (144) |  |  | 145 |
Income tax provision (benefit) |  | $ | 8,820 |  | $ | (83,128) |  | $ | 23 |
Schedule of significant components of current and long-term deferred income taxes |
|  | Year ended December 31, |
|  | 2018 |  | 2017 |
|  | (in thousands) |
Federal net operating loss carryforwards |  | $ | 42,397 |  | $ | 56,646 |
State net operating loss carryforwards |  |  | 1,387 |  |  | 1,586 |
Foreign net operating loss carryforwards |  |  | 641 |  |  | 758 |
Federal tax credit carryforwards |  |  | 16,200 |  |  | 14,312 |
State tax credit carryforwards |  |  | 6,489 |  |  | 6,908 |
Unremitted earnings of foreign subsidiaries |  |  | — |  |  | (21) |
Intangible assets |  |  | (29) |  |  | 116 |
Property, plant and equipment |  |  | 5,924 |  |  | 5,838 |
Accrued compensation |  |  | 97 |  |  | 45 |
Inventories |  |  | 3,713 |  |  | 3,798 |
Stock compensation |  |  | 2,760 |  |  | 2,351 |
Warranty |  |  | 1,090 |  |  | 980 |
Deferred revenue |  |  | 1,004 |  |  | 187 |
Other |  |  | (2,899) |  |  | (3,220) |
Deferred taxes, gross |  |  | 78,774 |  |  | 90,284 |
Valuation allowance |  |  | (6,835) |  |  | (7,136) |
Deferred taxes, net |  | $ | 71,939 |  | $ | 83,148 |
Schedule of reconciliation of the beginning and ending balance of unrecognized tax benefits |
|  |  | Year ended December 31, |
|  | 2018 |  | 2017 |  | 2016 |
|  | (in thousands) |
Balance at beginning of year |  | $ | 9,105 |  | $ | 6,844 |  | $ | 7,671 |
(Decrease) / increase in unrecognized tax benefits as a result of tax positions taken during a prior period |  |  | (132) |  |  | 81 |  |  | 76 |
Decreases in unrecognized tax benefits related to settlements with tax authorities |  |  | — |  |  | — |  |  | — |
Reductions to unrecognized tax benefits as a result of a lapse of the applicable statute of limitation |  |  | (543) |  |  | (511) |  |  | (903) |
Increases in unrecognized tax benefits as a result of tax positions taken during the current period |  |  | 697 |  |  | 2,691 |  |  | — |
Balance at end of year |  | $ | 9,127 |  | $ | 9,105 |  | $ | 6,844 |
Recorded as other long-term liability |  | $ | 676 |  | $ | 1,109 |  | $ | 1,462 |
Recorded as a decrease in deferred tax assets and offsetting valuation allowance |  |  | 8,451 |  |  | 7,996 |  |  | 5,382 |
Balance at end of year |  | $ | 9,127 |  | $ | 9,105 |  | $ | 6,844 |

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