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Acquisition of Silanis - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 25, 2015 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | $ 3,484 | $ 11,182 | $ 13,852 | $ 13,634 | $ 11,924 | $ 11,163 | $ 6,886 | $ 3,510 | $ 42,151 | $ 33,484 | $ 11,147
Valuation allowance |  | 13,719 |  |  |  | $ 2,500 |  |  |  | $ 13,719 | $ 2,500 |
Statutory income tax rate |  |  |  |  |  |  |  |  |  | 34.00% | 35.00% | 35.00%
Estimated amortization of acquired identifiable intangible assets |  |  |  |  |  |  |  |  |  | $ 4,942 | $ 4,532 | $ 3,325
Silanis Technology Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price | $ 75,000 |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 541 |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | (2,168) |  |
Unused investment tax credits |  | 340 |  |  |  |  |  |  |  | 340 |  |
Future tax benefit of foreign net operating loss carryforwards |  | 7,004 |  |  |  |  |  |  |  | 7,004 |  |
Future tax benefits of research and development expenses and other carryforwards |  | 4,217 |  |  |  |  |  |  |  | 4,217 |  |
Valuation allowance |  | 11,561 |  |  |  |  |  |  |  | 11,561 |  |
Purchase price allocation to identifiable intangible assets |  | $ 30,000 |  |  |  |  |  |  |  | 30,000 |  |
Estimated amortization of acquired identifiable intangible assets |  |  |  |  |  |  |  |  |  | 6,060 | 6,060 |
Estimated amortization of fair value adjustment of acquired deferred revenue |  |  |  |  |  |  |  |  |  | (4,000) | 0 |
Reclassify non-recurring transaction expenses |  |  |  |  |  |  |  |  |  |  | 5,812 |
Reverse benefit of refundable tax credits |  |  |  |  |  |  |  |  |  | $ 1,021 | $ 1,588 |
Silanis Technology Inc [Member] | Pro Forma [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Statutory income tax rate |  |  |  |  |  |  |  |  |  | 35.00% | 35.00% |
Silanis Technology Inc [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition related expense |  |  |  |  |  |  |  |  |  | $ 2,374 |  |

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