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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (unaudited) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Revenues:    
Product revenue, net $ 29,136,472 $ 12,448,438
Revenue, Product and Service [Extensible List] us-gaap:ProductMember us-gaap:ProductMember
Operating costs and expenses:    
Cost of sales $ 4,150,866 $ 1,711,788
Cost, Product and Service [Extensible List] us-gaap:ProductMember us-gaap:ProductMember
Research and development $ 4,222,811 $ 3,307,959
Selling, general and administrative 10,063,048 8,416,460
Total operating costs and expenses 18,436,725 13,436,207
Operating income (loss) 10,699,747 (987,769)
Other income, net 336,233 343,266
Net income (loss) before income taxes 11,035,980 (644,503)
Provision for income taxes 609,965  
Net income (loss) $ 10,426,015 $ (644,503)
Net income (loss) per share:    
Basic $ 0.10 $ (0.01)
Diluted $ 0.10 $ (0.01)
Weighted average shares outstanding:    
Basic 103,407,347 102,747,923
Diluted 106,534,600 102,747,923
Net income (loss) $ 10,426,015 $ (644,503)
Other comprehensive income (loss):    
Unrealized gain (loss) on available-for-sale securities 74,246 13,560
Comprehensive income (loss) $ 10,500,261 $ (630,943)