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Shareholders' Equity Components of share-based compensation expense (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Oct. 10, 2012
Oct. 14, 2011
Jan. 18, 2011
Jun. 02, 2010
Oct. 29, 2009
May. 09, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (3,214,033)                
Share-based Compensation Expense $ 9,750,100 $ 11,209,500 $ 6,838,700            
Cost of Sales [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based Compensation Expense 545,300 494,200 314,000            
Research and Development Expense [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based Compensation Expense 1,811,500 2,058,200 822,200            
General and Administrative Expense [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based Compensation Expense $ 7,393,300 $ 8,657,100 $ 5,702,500            
Stock Options [Member] | 2009 Equity Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common stock, shares authorized (shares) 8,995,000 5,995,000   450,000 2,375,000 1,775,000 1,375,000 975,000 380,000
Stock Options [Member] | Non US Equity Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common stock, shares authorized (shares)       570,000          
2015 Equity Plan [Member] [Member] | US Equity Plan [Member] | Stock Options [Member] | 2015 Equity Plan [Member] [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 0                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 0                
Shares Expired 0                
Common stock, shares authorized (shares) 4,400,000                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number (441,100)                
Common Stock, Shares, Outstanding (3,958,900)                
2009 Equity Plan [Member] | US Equity Plan [Member] | Stock Options [Member] | 2009 Equity Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (80,856)                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number (1,601,033)                
Shares Expired 0                
Common stock, shares authorized (shares) 8,995,000                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number (6,113,425)                
Common Stock, Shares, Outstanding (1,199,686)                
2003 Equity Plan [Member] | US Equity Plan [Member] | Stock Options [Member] | 2003 Equity Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (9,250)                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number (88,993)                
Shares Expired (43,012)                
Common stock, shares authorized (shares) 250,000                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number (108,745)                
Common Stock, Shares, Outstanding 0