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Fair Value Measurements (Details) - Fair Value, Measurements, Recurring
$ in Thousands
Sep. 30, 2018
USD ($)
Commercial paper  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Short-term investments $ 31,040
Corporate bonds  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Short-term investments 3,085
Money market funds  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash and cash equivalents 119,718
Level 1 | Commercial paper  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Short-term investments 0
Level 1 | Corporate bonds  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Short-term investments 0
Level 1 | Money market funds  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash and cash equivalents 119,718
Level 2 | Commercial paper  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Short-term investments 31,040
Level 2 | Corporate bonds  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Short-term investments 3,085
Level 2 | Money market funds  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash and cash equivalents 0
Level 3 | Commercial paper  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Short-term investments 0
Level 3 | Corporate bonds  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Short-term investments 0
Level 3 | Money market funds  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash and cash equivalents $ 0