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Fair Value Measurements - Summary of Financial Instruments Measured at Fair Value on Recurring Basis (Details) - Fair Value Measurements Recurring Basis - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Assets:    
Total assets at fair value $ 99,947 $ 20,769
Certificates of Deposit Included in Cash and Cash Equivalents    
Assets:    
Total assets at fair value 50,000  
Certificates of Deposit Included in Short-Term Marketable Securities    
Assets:    
Total assets at fair value 25,000  
Commercial Paper    
Assets:    
Total assets at fair value 24,947  
Money Market Funds Included in Cash and Cash Equivalents    
Assets:    
Total assets at fair value   20,769
Level 1    
Assets:    
Total assets at fair value   20,769
Level 1 | Money Market Funds Included in Cash and Cash Equivalents    
Assets:    
Total assets at fair value   $ 20,769
Level 2    
Assets:    
Total assets at fair value 99,947  
Level 2 | Certificates of Deposit Included in Cash and Cash Equivalents    
Assets:    
Total assets at fair value 50,000  
Level 2 | Certificates of Deposit Included in Short-Term Marketable Securities    
Assets:    
Total assets at fair value 25,000  
Level 2 | Commercial Paper    
Assets:    
Total assets at fair value $ 24,947