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Summary of Significant Accounting Policies (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Significant Accounting Policies [Line Items]        
Cost reimbursed to offset research and development expenses    $ 400,000 $ 20,000 $ 1,000,000
Share-based compensation forfeitures rate 12.00% 12.00% 12.00% 12.00%
Share options granted to employees 145,000 185,000 205,000 200,948
Unrecognized share-based compensation expense related to unvested awards 1,800,000   1,800,000  
Unrecognized share-based compensation expense related to unvested awards expected to be recognized in the period     2 years 1 month 17 days  
Income tax expense $ 11,206 $ 16,133 $ 20,949 $ 166,538
Anti-dilutive securities excluded from computation of earnings per share 11,700,000 11,600,000 11,700,000 11,600,000