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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Schedule of estimated useful lives of the related assets |
Asset Classification |  | Estimated Useful Life
Land and buildings (under lease) |  |  | Lesser of the lease term or estimated useful life of the asset |  |
Machinery and equipment |  |  | 7 to 10 years |  |
Schedule of components of net income per share |
|  | Year ended December 31, |
|  | 2018 |  | 2017 |  | 2016 |
|  | (in thousands, except per share data) |
Net income available to common stockholders |  | $ | 45,885 |  | $ | 126,959 |  | $ | 11,001 |
Weighted average common shares outstanding used in computing basic income per share |  |  | 32,286 |  |  | 30,866 |  |  | 29,195 |
Incremental options and RSUs |  |  | 1,716 |  |  | 2,570 |  |  | 1,752 |
Weighted average common shares used in computing diluted net income per share |  |  | 34,002 |  |  | 33,436 |  |  | 30,947 |
Net income per share |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.42 |  | $ | 4.11 |  | $ | 0.38 |
Diluted |  | $ | 1.35 |  | $ | 3.80 |  | $ | 0.36 |
Schedule of changes in accumulated other comprehensive income, net of tax |
|  | Foreign |  | Defined benefit |  |  |  |
|  | currency |  | pension plan |  | Total |
|  | (in thousands) |
Balance at December 31, 2017 |  | $ | 2,756 |  | $ | (580) |  | $ | 2,176 |
Other comprehensive income and pension reclassification |  |  | (1,794) |  |  | 66 |  |  | (1,728) |
Balance at December 31, 2018 |  | $ | 962 |  | $ | (514) |  | $ | 448 |
ASU 2014-09 |
Schedule of new accounting pronouncements and changes in accounting principles | The impact of adoption on our consolidated statement of operations for the twelve months ended December 31, 2018 and consolidated balance sheet as of December 31, 2018 was as follows (in thousands):
|  |  | Twelve months ended
|  |  | December 31, 2018
Consolidated Statement of Operations |  |  | As Reported |  | ASC 606 Adjustments |  | Pro Forma Under ASC 605
Revenue: |  |  |  |  |  |  |  |  |  |
Product |  |  | $ | 415,922 |  | $ | (1,023) |  | $ | 414,899
Total revenue |  |  |  | 442,575 |  |  | (1,023) |  |  | 441,552
Gross profit |  |  |  | 179,636 |  |  | (1,023) |  |  | 178,613
Income from operations |  |  |  | 59,959 |  |  | (1,023) |  |  | 58,936
Income before income taxes |  |  |  | 54,705 |  |  | (1,023) |  |  | 53,682
Income tax provision |  |  |  | 8,820 |  |  | (165) |  |  | 8,655
Net income |  |  | $ | 45,885 |  | $ | (858) |  | $ | 45,027
Net income per share: |  |  |  |  |  |  |  |  |  |
Basic |  |  | $ | 1.42 |  | $ | (0.03) |  | $ | 1.39
Diluted |  |  | $ | 1.35 |  | $ | (0.03) |  | $ | 1.32
|  | December 31, 2018
Consolidated Balance Sheet |  | As Reported |  | ASC 606 Adjustments |  | Pro Forma Under ASC 605
Deferred income taxes |  | $ | 71,939 |  | $ | 165 |  | $ | 72,104
Total assets |  | $ | 548,441 |  | $ | 165 |  | $ | 548,606
Deferred revenue |  | $ | 22,584 |  | $ | 2,623 |  | $ | 25,207
Total current liabilities |  |  | 84,997 |  |  | 2,623 |  |  | 87,620
Total liabilities |  |  | 140,104 |  |  | 2,623 |  |  | 142,727
Accumulated deficit |  |  | (157,260) |  |  | (2,458) |  |  | (159,718)
Total stockholders' equity |  |  | 408,337 |  |  | (2,458) |  |  | 405,879
Total liabilities and stockholders' equity |  | $ | 548,441 |  | $ | 165 |  | $ | 548,606

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