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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 03, 2014
USD ($)
Dec. 31, 2016
USD ($)
Segment
Dec. 31, 2015
USD ($)
Summary Of Significant Accounting Policies [Line Items]        
Number of operating segments | Segment     2  
Number of reporting segment | Segment     1  
Transfers between Levels 1, 2 and 3     $ 0 $ 0
Cash and cash equivalents, carrying amount $ 58,527,000   31,908,000 30,915,000
Impairment of intangible assets     200,000 $ 310,000
Discount rate       13.00%
Net Book Value       $ 200,000
IPO costs reclassified to additional paid-in capital   $ 3,900,000   377,000
Payments related to IPO     $ 377,000  
Maximum percentage of recognition of tax benefits from uncertain tax positions     50.00%  
IPO [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Payments related to IPO 2,900,000      
Remaining amount of IPO costs included in accounts payable $ 1,000,000      
IPR&D [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Impairment of intangible assets     $ 200,000 300,000
Net Book Value     0 200,000
Quoted Prices in Active Markets (Level 1) [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Assets, fair value disclosure, recurring     0 0
Liabilities, fair value disclosure, recurring     0 0
Quoted Prices in Active Markets (Level 1) [Member] | Money Market Funds [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Cash and cash equivalents, fair value     30,300,000 25,800,000
Significant Other Observable Inputs (Level 2) [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Assets, fair value disclosure, recurring     0 0
Liabilities, fair value disclosure, recurring     0 0
Significant Unobservable Inputs (Level 3) [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Assets, fair value disclosure, recurring     0 0
Liabilities, fair value disclosure, recurring     $ 0 $ 0