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Stock-Based Compensation Plans (Narrative) (Details) (USD $)
 3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Jun. 30, 2012
Employee Stock Option Plan [Member]
Jun. 30, 2012
Non-Employee Director Stock Option Plan [Member]
May 31, 2012
Non-Employee Director Stock Option Plan [Member]
Jun. 30, 2012
Restricted Stock Plan [Member]
Jun. 30, 2012
Minimum [Member]
Jun. 30, 2012
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Compensation expense for share-based payments $ 3,554,026 $ 6,959,580            
Compensation cost capitalized as part of inventory   199,263            
Option vesting period       6 months     1 year 5 years
Option expiration period       10 years     3 years 7 years
Unrecognized compensation cost     21,595,931 249,887        
Shares approved     1,200,000          
Shares approved       42,000 500,000 2,000,000    
ESPP discount rate     85.00%          
ESPP discount rate recognized as compensation expense     15.00%          
Restricted period, maximum, in years           10 years    
Unearned stock-based compensation           7,494,250    
Amortization expense $ 477,099 $ 1,032,125