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Investments - Summary of Contingent Consideration Measured at Fair Value (Detail) - Contingent Consideration
$ in Thousands
9 Months Ended
Jun. 30, 2018
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
September 30, 2017 $ 354
Contingent consideration associated with the ICAR Acquisition 2,867
Expenses recorded due to changes in fair value 1,397
Payment of contingent consideration (1,489)
Issuance of common stock (710)
Foreign currency effect on contingent consideration (58)
Balance at June 30, 2018 $ 2,361