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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
1 Months Ended 9 Months Ended
May 31, 2016
ft²
Jan. 31, 2016
USD ($)
Apr. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
ft²
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Summary Of Significant Accounting Policies [Line Items]            
Payment of offering costs   $ 600 $ 600 $ 599 $ 548  
Restricted cash deposit       564   $ 39
Operating Lease One [Member] | Multi Tenant Building [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Restricted cash deposit       $ 500    
Additional Office space rented under operating lease | ft² 19,805     22,067    
Lease expire date Feb. 28, 2022