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Stockholders' Equity - Additional information (Detail) (USD $)
 1 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended
Aug. 31, 2012
Y
Dec. 31, 2012
Dec. 31, 2012
Minimum
Dec. 31, 2012
Maximum
Dec. 31, 2012
Non Executive Director
Dec. 31, 2012
Cliff Vesting
Dec. 31, 2012
Warrants
A$ warrants
Dec. 31, 2011
Warrants
A$ warrants
Dec. 31, 2012
Warrants
US$ Warrants
Dec. 31, 2011
Warrants
US$ Warrants
Jun. 30, 2012
Warrants
US$ Warrants
Jun. 30, 2011
Warrants
US$ Warrants
Dec. 31, 2012
2008 Incentive Plan
Dec. 31, 2012
2008 Incentive Plan
Dec. 31, 2012
Employee Share Option Plan
Sep. 30, 2012
Employee Share Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Common stock issued to institutional investors 2,494,419                              
Number of warrants to purchase shares of common stock issued 623,605                              
Proceeds from issuance of common stock and warrants $ 5,400,000                              
Issue price per unit $ 2.15                              
Percentage of warrants on common stock 25.00%                              
Warrant exercise price $ 2.50                              
Term of warrants 5                              
Stock issuance costs 694,000                              
Outstanding warrants remaining contract life   3 years 10 months 24 days 3 years 1 month 6 days 4 years 7 months 6 days                        
Number of Warrants, Balance at Beginning of period               205,479 1,176,105 4,800,047 2,064,710 7,614,748        
Number of Warrants, Expired               205,479 1,512,210 2,814,701            
Number of Warrants, Issued             0 0 623,605              
Number of Warrants Exercisable at end of period             0 0                
Weighted average exercise price of warrants               $ 7.68   $ 7.81            
Shares of Common Stock Authorized for Stock-Based Awards                         4,841,255 4,841,255    
Options granted with annual vesting   411,760     60,000 145,000               616,760    
Vesting period of granted options   4 years     3 years 1 year             3 years      
Fair value of options granted   $ 1.29                            
Options vested during the period   625,826                            
Contractual life of option grants   10 years                         5 years  
Remaining options expired exercised                               112,500
Unrecognized compensation expense   $ 1,400,000                            
Unrecognized compensation expense weighted average period   1 year 8 months 12 days