XML 68 R57.htm IDEA: XBRL DOCUMENT v3.20.2
Income Taxes - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]        
Unrecognized tax benefits $ 2,500,000 $ 2,500,000 $ 2,500,000  
Changes in unrecognized tax benefits   $ 0    
Effective income tax rate from continuing operations 0.00%      
Federal statutory income tax rate 21.00%      
Operating loss carryforwards state     205,200,000  
Operating loss carryforwards federal     128,200,000  
Federal and state net operating loss carryforwards, expiring year       2039
State research and development tax credit carryforwards     $ 3,200,000  
Cumulative change in ownership percentage     50.00%  
Period for cumulative change in ownership     3 years