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Correction of Previously Issued Financial Data - Effects of Corrected Calculation of Financial Data (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Sep. 30, 2014
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Net loss attributable to common stockholders $ (4,932)   $ (11,147)       $ (21,631) $ (21,627)
Net loss per share attributable to common stockholders, basic and diluted $ (0.34)   $ (59.60)       $ (3.69) $ (115.78)
Weighted average shares used to compute basic and diluted net loss per share attributable to common stockholders 14,654,427   187,044       5,860,758 186,792
Options to Purchase Common Stock [Member]                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Potential dilutive securities excluded from computation of diluted net loss per common share             2,224,270 806,015
Convertible Notes and Accrued Interest [Member]                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Potential dilutive securities excluded from computation of diluted net loss per common share               5,802,189
Scenario, Previously Reported [Member]                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Net loss attributable to common stockholders   $ (14,897)   $ (6,954) $ (16,699) $ (10,481)    
Net loss per share attributable to common stockholders, basic and diluted   $ (2.66)   $ (2.21) $ (3.79) $ (3.33)    
Weighted average shares used to compute basic and diluted net loss per share attributable to common stockholders   5,608,429   3,145,521 4,401,087 3,145,283    
Scenario, Previously Reported [Member] | Options to Purchase Common Stock [Member]                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Potential dilutive securities excluded from computation of diluted net loss per common share           832,184    
Scenario, Previously Reported [Member] | Convertible Notes and Accrued Interest [Member]                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Potential dilutive securities excluded from computation of diluted net loss per common share           327,505    
Scenario, Actual [Member]                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Net loss attributable to common stockholders   $ (14,897)   $ (6,954) $ (16,699) $ (10,481)    
Net loss per share attributable to common stockholders, basic and diluted   $ (5.77)   $ (37.21) $ (12.00) $ (56.15)    
Weighted average shares used to compute basic and diluted net loss per share attributable to common stockholders   2,580,144   186,901 1,391,048 186,663    
Scenario, Actual [Member] | Options to Purchase Common Stock [Member]                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Potential dilutive securities excluded from computation of diluted net loss per common share           832,226    
Scenario, Actual [Member] | Convertible Notes and Accrued Interest [Member]                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Potential dilutive securities excluded from computation of diluted net loss per common share           5,525,341