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Fair Value Measurements - Nonrecurring Fair Value Measurements - Equity Method Investment (Details) - USD ($)
$ in Thousands
Nov. 28, 2016
Sep. 30, 2017
Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity method investments   $ 28,593 $ 27,273
BioCision, LLC      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity method investments $ 1,200   $ 1,700
BioCision, LLC | Equity Method Investments      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity value $ 6,500    
Expected volatility rate (as a percent) 80.00%    
Expected payoff period (in years) 1 year 6 months    
Risk free interest rate (as a percent) 0.96%    
BioCision, LLC | Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity method investments, fair value $ 3,100