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Stockholders' Equity - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Sep. 30, 2011
Mar. 31, 2011
Sep. 24, 2008
Jun. 27, 2008
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2011
Sep. 30, 2011
2005 Management Stock Option Plan
Nov. 30, 2007
2005 Management Stock Option Plan
Jun. 30, 2013
2005 Management Stock Option Plan
Jun. 30, 2012
2005 Management Stock Option Plan
Jun. 30, 2011
2005 Management Stock Option Plan
Jun. 30, 2013
2005 Management Stock Option Plan
Maximum
Sep. 30, 2011
2005 Stock Incentive Plan
Feb. 28, 2009
2005 Stock Incentive Plan
Jun. 30, 2013
2005 Stock Incentive Plan
Jun. 30, 2012
2005 Stock Incentive Plan
Jun. 30, 2011
2005 Stock Incentive Plan
Jun. 30, 2013
2000 Non-Management Stock Option Plan
Jun. 30, 2011
2000 Non-Management Stock Option Plan
Jun. 30, 2013
1998 Stock Plan
Jun. 30, 2011
1998 Stock Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                            
Preferred stock, authorized         5,000,000                                  
Preferred stock par value per share         $ 0.001                                  
Preferred stock, outstanding         0                                  
Warrants to purchase shares of common stock     1,525,515 73,889                                    
Warrants exercise price     $ 0.95 $ 0.90                                    
Fair value of warrants expected life     3 years 3 years 4 years 6 months 4 years 5 months 23 days 4 years 6 months                              
Expected stock price volatility     80.00% 80.00% 85.00% 85.00% 82.00%                              
Risk free interest rate     2.26% 3.14% 0.80% 0.97% 1.82%                              
Dividend yield     0.00% 0.00%                                       
Amortization period of warrants     3 years                                      
Warrants exercised 307,022 1,218,493                                        
Issuance of common stock due to exercise of warrants 238,393                                          
Increased in shares               500,000 500,000         1,000,000 1,000,000              
Option granted at price not less than percentage of fair market value of the common stock on the date of grant                   100.00%                 85.00%   85.00%  
Right of repurchase, lapse rate with respect to shares granted                   2.08%                        
Exercisable period from the date of grant                         10                  
Option vest, minimum years                               4 years     4 years   4 years  
Option vest, maximum years                               10 years     10 years   10 years  
Plan expired                                     July 2010   November 2010  
Closing stock price         $ 9.62                                  
Total intrinsic value of the options exercised during the period         $ 3,000,000 $ 691,000 $ 1,000,000                              
Options granted during period         338,550 720,300 280,450       340,000 115,000       338,550 380,300 165,450   (25,953)   (39,216)
Options granted during period, weighted-average price         $ 4.05 $ 3.21 $ 1.21       $ 4.56 $ 1.97       $ 6.48 $ 5.53 $ 1.89   $ 0.90   $ 0.73
Option granted but not yet vested         $ 1,400,000                                  
Expected to be recognized         1 year 4 months 6 days