XML 24 R31.htm IDEA: XBRL DOCUMENT v2.4.0.6
Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash Equivalents and Concentrations of Credit Risk [Abstract]      
Maximum number of months of investments with original maturities from date of acquisition to be cash equivalents 3 months    
Accounts Receivable [Abstract]      
Uncollectable, accounts receivable $ 0    
Inventories [Abstract]      
Reserves for expired, obsolete, or slow-moving inventory $ 0    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Shares excluded from the computation of diluted EPS (in shares) 10,932,935 6,836,215 6,341,174
Segment Information [Abstract]      
Number of business segments 1    
Stock options [Member]
      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Shares excluded from the computation of diluted EPS (in shares) 4,788,887 4,129,749 3,760,650
Unvested restricted shares [Member]
      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Shares excluded from the computation of diluted EPS (in shares) 501,468 193,532 67,590
Warrants [Member]
      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Shares excluded from the computation of diluted EPS (in shares) 5,642,580 2,512,934 2,512,934
Minimum [Member]
      
Property, Plant and Equipment [Line Items]      
Estimated useful lives 3 years    
Maximum [Member]
      
Property, Plant and Equipment [Line Items]      
Estimated useful lives 7 years