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Stockholders' Equity - Additional Information (Detail) (USD $)
0 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended
Aug. 02, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Mar. 31, 2014
Sep. 30, 2014
Research and development expense [Member]
Sep. 30, 2013
Research and development expense [Member]
Sep. 30, 2014
Research and development expense [Member]
Sep. 30, 2013
Research and development expense [Member]
Sep. 30, 2014
General and administrative expense [Member]
Sep. 30, 2013
General and administrative expense [Member]
Sep. 30, 2014
General and administrative expense [Member]
Sep. 30, 2013
General and administrative expense [Member]
Sep. 30, 2014
Equity Distribution Agreement [Member]
Mar. 31, 2014
Equity Distribution Agreement [Member]
Nov. 30, 2013
Equity Distribution Agreement [Member]
Maximum [Member]
Sep. 30, 2014
Restricted stock units (RSUs) [Member]
Sep. 30, 2013
Restricted stock units (RSUs) [Member]
Sep. 30, 2014
Restricted stock units (RSUs) [Member]
Sep. 30, 2013
Restricted stock units (RSUs) [Member]
Sep. 30, 2014
Restricted stock units (RSUs) [Member]
Consultants [Member]
Sep. 30, 2013
Restricted stock units (RSUs) [Member]
Consultants [Member]
Sep. 30, 2014
Restricted stock [Member]
Sep. 30, 2013
Restricted stock [Member]
Sep. 30, 2014
Restricted stock [Member]
Sep. 30, 2013
Restricted stock [Member]
Sep. 30, 2014
Equity Incentive Plan 2008 [Member]
Sep. 30, 2013
Equity Incentive Plan 2008 [Member]
May 31, 2008
Equity Incentive Plan 2008 [Member]
Aug. 02, 2013
Underwriting Agreement [Member]
Jul. 17, 2013
Underwriting Agreement [Member]
Aug. 02, 2013
Underwriting Agreement [Member]
Overallotment Option Exercised [Member]
Sep. 30, 2014
Equity Incentive Plan 2012 [Member]
Aug. 31, 2013
Equity Incentive Plan 2012 [Member]
Jan. 31, 2012
Equity Incentive Plan 2012 [Member]
Class of Stock [Line Items]                                                                        
Shares authorized under shelf registration statement   150,000,000   150,000,000   150,000,000                                                   100,000,000        
Issuance of common stock   80,404,648   80,404,648   78,113,639                                                 10,350,000   1,350,000      
Offering price per share $ 4.50                                                           $ 4.23          
Proceeds from issuance of common stock $ 43,400,000                                                                      
Underwriting discounts and commissions and other offering expenses 3,200,000                                                                      
Number of shares to be offered and sold in equity distribution agreement                                 4,000,000                                      
Issuance of common stock from stock options exercises, net, Shares   28,224 7,300 88,746 7,300                   2,197,768 334,412                                        
Value of shares sold under equity distribution agreement                             16,100,000 3,500,000                                        
Issuance of common stock from warrant exercises, net, Shares   0 1,670,851 110,600 1,870,986                                                              
Warrants exercised   0 2,026,428 111,647 2,278,557                                                              
Stock option exercised   28,224 7,300 88,746 7,300                                                              
Common shares authorized to be issued                                                           1,521,584         5,000,000 6,553,986
Shares issued during the year                                                       0 0              
Termination date of Equity Incentive Plan                                                       Jul. 01, 2018                
Shares available for issuance                                                                     11,553,986  
Termination period of Equity Incentive Plan                                                                   10 years    
Restricted stock awards granted       0                                   0 60,000                          
Restricted stock surrendered                                   103,804 160,540 106,105 163,083                              
Restricted stock awards vested during the period       196,250                           190,000 296,250 196,250 302,500                              
Stock option granted with immediate vesting                                   103,804 160,540 106,105 163,083                              
Restricted stock awards issued to member of senior management       200,000                                                                
Total employee stock-based compensation recorded as operating expenses             4,000 4,000 8,000 8,000 130,000 127,000 259,000 525,000                   134,000 131,000 267,000 533,000                  
Unrecognized restricted stock-based compensation expense                                               $ 466,000   $ 466,000                    
Total unrecognized compensation cost related, weighted average period                                                   1 year 7 days