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Stockholders' Equity - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended
Jun. 23, 2015
Jun. 18, 2015
Aug. 02, 2013
Nov. 30, 2013
Jun. 30, 2015
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2015
Feb. 27, 2015
Aug. 31, 2013
Jul. 17, 2013
Jan. 31, 2012
May. 31, 2008
Class Of Stock [Line Items]                          
Issuance of common stock         92,426,404     81,536,724          
Offering price per share     $ 4.50                    
Proceeds from issuance of common stock     $ 43,400,000                    
Underwriting discounts and commissions and other offering expenses     $ 3,200,000                    
Issuance of common stock from stock options exercises, net, Shares 10,838,750       25,503   60,522            
Gross proceeds from sale of common stock shares $ 46,100,000                        
Common stock, par value         $ 0.001     $ 0.001          
Issuance of common stock from warrant exercises, net, Shares         30,186   110,600            
Warrants exercised         38,234   111,647            
Stock option exercised         25,503   60,522            
Stock option granted with immediate vesting         2,259 2,301              
Research and development expense [Member]                          
Class Of Stock [Line Items]                          
Total employee stock-based compensation recorded as operating expenses         $ 0   $ 4,000            
General and administrative expense [Member]                          
Class Of Stock [Line Items]                          
Total employee stock-based compensation recorded as operating expenses         $ 103,000   129,000            
Restricted stock units (RSUs) [Member]                          
Class Of Stock [Line Items]                          
Restricted stock surrendered         2,259 2,301              
Restricted stock awards vested during the period         6,250 6,250              
Restricted stock [Member]                          
Class Of Stock [Line Items]                          
Restricted stock awards vested during the period         6,250                
Total employee stock-based compensation recorded as operating expenses         $ 103,000   $ 133,000            
Unrecognized restricted stock-based compensation expense         $ 115,000                
Total unrecognized compensation cost related, weighted average period         5 months 16 days                
Equity Distribution Agreement [Member]                          
Class Of Stock [Line Items]                          
Issuance of common stock from stock options exercises, net, Shares         2,532,180   0            
Value of shares sold under equity distribution agreement         $ 19,600,000                
Equity Offering Sales Agreement [Member]                          
Class Of Stock [Line Items]                          
Issuance of common stock         0                
Issuance of common stock from stock options exercises, net, Shares         1,000,000                
Gross proceeds from sale of common stock shares         $ 6,200,000                
Maximum [Member] | Equity Distribution Agreement [Member]                          
Class Of Stock [Line Items]                          
Securities authorized for offer and sale, amount         $ 26,777,785                
Number of shares to be offered and sold in equity distribution agreement       4,000,000                  
Underwriting Agreement [Member]                          
Class Of Stock [Line Items]                          
Stock option exercisable, period   30 days                      
Additional common stock issued on exercise of option by underwriters   1,413,750                      
Equity Incentive Plan 2008 [Member]                          
Class Of Stock [Line Items]                          
Common shares authorized to be issued                         1,521,584
Termination date of Equity Incentive Plan         Jul. 01, 2018                
Shares issued during the year         0                
Equity Incentive Plan 2012 [Member]                          
Class Of Stock [Line Items]                          
Common shares authorized to be issued                   5,000,000   6,553,986  
Shares available for issuance                   11,553,986      
Termination period of Equity Incentive Plan         10 years                
IPO [Member]                          
Class Of Stock [Line Items]                          
Securities authorized for offer and sale, amount                 $ 190,000,000   $ 100,000,000    
Secondary Offering [Member]                          
Class Of Stock [Line Items]                          
Issuance of common stock     10,350,000                    
Offering price per share     $ 4.23                    
Secondary Offering [Member] | Underwriting Agreement [Member]                          
Class Of Stock [Line Items]                          
Issuance of common stock   10,838,750                      
Offering price per share   $ 4.25                      
Gross proceeds from sale of common stock shares   $ 43,200,000                      
Common stock, par value   $ 0.001                      
Over Allotment Option | Underwriting Agreement [Member]                          
Class Of Stock [Line Items]                          
Issuance of common stock   9,425,000 1,350,000                    
Sale of stock price per share net of fees   $ 3.995