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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2017 | Dec. 31, 2017 | Dec. 13, 2017 | Nov. 30, 2017 | Feb. 29, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Payment for earnout amount | $ 2.0 |  |  |  |
Equity interest acquired |  | 93.80% |  | 93.80% |
Convertible Notes |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Debt instrument, interest rate |  | 0.25% |  |  |
Other Long-term Liabilities | ASC 815-10, Derivatives and Hedging |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Equity method Investment, noncurrent liabilities |  | $ 2.2 | $ 2.2 |  |
EpiWorks | Upon Achievement of Financial and Operational Targets For Capacity Wafers Output and Gross Margin | Maximum |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Business acquisitions, contingent consideration |  |  |  |  | $ 6.0
IPI | Upon Achievement of Financial And Transitional Objectives Relating to Finance Information Technology And Human Resources | Maximum |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Business acquisitions, contingent consideration | $ 2.5 |  |  |  |

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