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Stock-Based Compensation - Additional Information (Detail) (USD $)
1 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended
Nov. 30, 2013
Sep. 30, 2014
Sep. 30, 2014
Restricted Stock [Member]
Sep. 30, 2014
Employee Stock Option [Member]
Nov. 30, 2013
Board of Directors [Member]
Maximum [Member]
Nov. 30, 2013
Board of Directors [Member]
Minimum [Member]
Sep. 30, 2014
2013 Stock Plan [Member]
Sep. 30, 2014
2013 Stock Plan [Member]
Nov. 30, 2013
2013 Stock Plan [Member]
Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common stock, capital shares reserved for future issuance   11,589,342             3,605,445
Share-based compensation arrangement by share-based payment award, options, grants in period, gross               7,167,585  
Share-based compensation arrangement by share-based payment award, options, forfeitures in period               424,170  
Employee service share-based compensation, nonvested awards, compensation not yet recognized, stock options             $ 3,915,031 $ 3,915,031  
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition               1 year 5 months 19 days  
Non-employee service share-based compensation, nonvested awards, compensation not yet recognized, stock options             (67,910)    
Non employee service share based compensation nonvested awards total compensation cost not yet recognized period for recognition1             1,312,993 1,312,993  
Share-based compensation arrangement by share-based payment award, options, vested, number of shares               2,730,198  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value     $ 0 $ 0          
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent 110.00%                
Share based Compensation Arrangement By Sharebased Payment Award Common Stock Percent 10.00%                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         5 years 1 year