General form of registration statement for all companies including face-amount certificate companies

Summary of significant accounting policies - Additional Information (Details)

v2.4.0.8
Summary of significant accounting policies - Additional Information (Details) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Segment
Dec. 31, 2011
Dec. 31, 2010
Debt Instrument [Line Items]          
Cash insured $ 250,000   $ 250,000    
Cash balances in bank accounts, uninsured amount     1,070,000 3,200,000 1,167,000
Short-term investments minimum maturity     3 months    
Short-term investments maximum maturity     1 year    
Allowance for doubtful accounts 119,700   154,400 96,800  
Advertising expense 42,000 70,000 187,500 86,700 14,900
Research and development costs reimbursed by government agencies 106,000 81,500 126,500 239,000 917,000
Noncontrolling Interest, Ownership Percentage by Parent     65.00%    
Loss on Contracts 300,000        
Cash Equivalents, at Carrying Value 19,817        
Research And Development Arrangements With Government Agencies, Retainage Receivable 109,221   154,700    
Number of Operating Segments 1   1    
segment [Member]
          
Debt Instrument [Line Items]          
Allowance for doubtful accounts 119,700   154,400    
Research And Development Arrangements With Government Agencies, Retainage Receivable $ 109,221        
Ilios [Member]
          
Debt Instrument [Line Items]          
Noncontrolling Interest, Ownership Percentage by Parent 65.00%   65.00% 67.40% 63.00%
Restricted stock | Ilios [Member]
          
Debt Instrument [Line Items]          
Noncontrolling Interest, Ownership Percentage by Parent 63.70%