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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended
Apr. 21, 2009
Mar. 31, 2009
Dec. 31, 2012
Segment
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2012
Patents
Dec. 31, 2012
Stock Option and Warrant
Dec. 31, 2011
Stock Option and Warrant
Dec. 31, 2010
Stock Option and Warrant
Jan. 31, 2010
Hansen
Dec. 31, 2012
Hansen
Jan. 31, 2010
Carilion Clinic
Dec. 31, 2012
Carilion Clinic
Dec. 31, 2011
Carilion Clinic
Dec. 31, 2010
Carilion Clinic
May 31, 2008
Carilion Clinic
Jan. 31, 2010
Carilion Clinic
Maximum
Jan. 31, 2010
Carilion Clinic
Before Amendment
Dec. 31, 2010
Carilion Clinic
Before Amendment
Minimum
Dec. 31, 2010
Carilion Clinic
Before Amendment
Maximum
Jan. 31, 2010
Carilion Clinic
After Amendment
Jan. 31, 2010
Carilion Clinic
Series A Convertible Preferred Stock
Significant Accounting Policies [Line Items]                                              
Number of operating segments     2                                        
Issuance of common stock, legal settlement (in shares)                     1,247,330 1,200,000                      
Damages awarded to the plaintiff $ 36,300,000                                            
Litigation settlement agreement date           December 11, 2009                                  
Litigation settlement   36,300,000                                          
Litigation settlement accrued           9,700,000                                  
Senior convertible Promissory Notes principal amount converted                         5,000,000                    
Accrued interest converted                         1,200,000                    
Preferred stock issued in exchange of notes payable, shares                                             1,321,514
Warrants issued in exchange of notes payable, shares                         356,000       356,000              
Warrant exercise price                     0.01   2.50       7.98   7.98     2.50  
Warrant exercisable date                                       Feb. 01, 2013 Dec. 31, 2020    
Warrant expiration date                                           Dec. 31, 2020  
Percentage of Dividend Payable On Series A Convertible Preferred Stock                         6.00%                    
Preferred stock liquidation preference value                                   6,200,000          
Dividend on preferred stock, shares of common stock issuable     79,233 79,233 76,649                 235,233                  
Conversion of stock description                           Each share of Series A Convertible Preferred Stock may be converted into one share of our common stock at the option of the holder.                  
Allowance for uncollectible receivables     0 22,372 22,000                                    
Finite lived intangible asset, useful life             5 years                                
Research, development, and engineering     2,558,417 2,674,730 1,694,643                                    
Inventory Reserves     $ 108,649 $ 172,902                                      
Antidilutive securities excluded from computation of earnings per share amount               2,400,000 2,500,000 6,500,000