Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details Textual)

v3.20.1
Income Taxes (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Taxes (Textual)    
Net operating loss expiration date Dec. 31, 2033  
Deferred tax assets, valuation allowance $ 49,900,000 $ 46,400,000
State income tax purposes, net operating losses 71,500,000  
Federal income tax purposes, net operating losses 140,600,000  
Research Tax Credit Carryforward [Member] | Domestic Tax Authority [Member]    
Income Taxes (Textual)    
Net operating losses $ 1,800,000  
Net operating loss expiration date Dec. 31, 2033  
Orphan Drug Credits [Member]    
Income Taxes (Textual)    
Net operating losses $ 9,100,000  
Net operating loss expiration date Dec. 31, 2037