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Revenues (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Product Revenues      
Net product revenue $ 40,376,563 $ 32,478,185 $ 33,013,184
Accrued liabilities, current 8,714,814 6,755,652  
Other Revenues      
Other revenue, upfront payment 1,500,000    
Other revenue, potential upfront payments related to regulatory approval 2,400,000    
Other revenue, potential upfront payment related to product sales 4,600,000    
Cumulative upfront payment 1,500,000    
Revenue related to milestone payments 100,000    
Product Sales Related Accruals - Rebates, Product Returns, Administrative Fees and Service Fees      
Product Revenues      
Accrued liabilities, current 4,700,000 4,100,000  
Product, Caldolor      
Product Revenues      
Net product revenue 4,178,443 4,132,833 3,112,128
Product, Acetadote, Generic      
Product Revenues      
Net product revenue 4,600,000 4,800,000 4,500,000
Product, Ethyol      
Product Revenues      
Net product revenue 10,835,038 838,386 0
Product Sales Related Allowances - Chargebacks, Cash Discounts and Damaged Goods      
Product Revenues      
Accounts receivable, allowances, current 500,000    
Collaborative Arrangement, Federal Small Business Grant Programs      
Other Revenues      
Other revenues, grants $ 200,000 $ 100,000 $ 200,000