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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2018
Jun. 30, 2017
Feb. 29, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Payment for earnout amount $ 2,500 $ 2,000  
Convertible Notes      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Debt instrument, interest rate 0.25%    
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     $ 6,000