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Stock-Based Compensation Plans (Narrative) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
plan
shares
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
plan
shares
Sep. 30, 2014
USD ($)
May. 31, 2014
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense for share-based payments $ 4,404,297 $ 4,778,693 $ 13,979,297 $ 13,391,738  
Compensation cost capitalized as part of inventory     279,903    
Employee Stock Option Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares available for grant (in shares) | shares         24,000,000
Unrecognized compensation cost $ 22,971,517   $ 22,971,517    
Employee Stock Option Plan [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Option vesting period     1 year    
Option expiration period     5 years    
Employee Stock Option Plan [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Option vesting period     5 years    
Option expiration period     7 years    
Non-Employee Director Stock Option Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Option vesting period     6 months    
Option expiration period     10 years    
Number of shares authorized (in shares) | shares 1,000,000   1,000,000    
Unrecognized compensation cost $ 71,922   $ 71,922    
Options granted (in shares) | shares     315,000    
Employee Stock Purchase Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares approved (in shares) | shares 2,000,000   2,000,000    
ESPP discount rate     85.00%    
ESPP discount rate recognized as compensation expense     15.00%    
Restricted Stock Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized (in shares) | shares 9,000,000   9,000,000    
Restricted period, maximum, in years     10 years    
Unearned stock-based compensation $ 11,698,198   $ 11,698,198    
Amortization expense $ 905,772   $ 2,555,310    
Equity Incentive Plans [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of plans (in plans) | plan 4   4    
Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of plans (in plans) | plan 2   2