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Short-Term Investments - Summary of Available-for-Sale Securities (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2015
USD ($)
Schedule Of Available For Sale Securities [Line Items]  
Amortized Cost $ 49,952
Unrealized Gains 1
Unrealized Losses (6)
Fair Value 49,947
Certificates of Deposit  
Schedule Of Available For Sale Securities [Line Items]  
Amortized Cost 25,000
Fair Value 25,000
Commercial Paper  
Schedule Of Available For Sale Securities [Line Items]  
Amortized Cost 24,952
Unrealized Gains 1
Unrealized Losses (6)
Fair Value $ 24,947