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Stock-Based Compensation Plans (Narrative) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
plan
shares
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
plan
shares
Sep. 30, 2016
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense for share-based payments | $ $ 3,067,076 $ 3,724,780 $ 9,957,687 $ 11,558,462
Compensation cost capitalized as part of inventory | $     $ 286,765 $ 317,315
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   24,000,000  
Unrecognized compensation cost | $ $ 12,629,199   $ 12,629,199  
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  
Unrecognized compensation cost | $ $ 66,764   $ 66,764  
Number of shares authorized (in shares) | shares 1,000,000   1,000,000  
Options granted (in shares) | shares     427,000  
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%  
Shares granted (in shares) | shares 760,890   760,890  
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 | $ $ 20,074,695   $ 20,074,695  
Amortization expense | $ $ 1,788,162   $ 4,014,820  
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