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Income Taxes Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating Loss Carryforwards [Line Items]                      
Income tax expense (benefit) $ (87,764) $ 0 $ (106,771) $ (62,800) $ 0 $ 0 $ 0 $ 2,169,811 $ (257,335) $ 2,169,811 $ 0
Tax benefits expired 10,600,000               10,600,000    
Unrecognized tax benefits that would impact effective tax rate 9,900,000       $ 8,300,000       9,900,000 $ 8,300,000 $ 7,100,000
Federal                      
Operating Loss Carryforwards [Line Items]                      
Net operating loss carryforwards that will expire due to IRC Section 382 limitations 483,300,000               483,300,000    
Net operating loss carryforwards 186,600,000               186,600,000    
State                      
Operating Loss Carryforwards [Line Items]                      
Net operating loss carryforwards 149,100,000               149,100,000    
California                      
Operating Loss Carryforwards [Line Items]                      
Net operating loss carryforwards that will expire due to IRC Section 382 limitations 68,600,000               68,600,000    
Pennsylvania                      
Operating Loss Carryforwards [Line Items]                      
Net operating loss carryforwards that will expire due to IRC Section 382 limitations 80,500,000               80,500,000    
Research Tax Credit Carryforward | Federal                      
Operating Loss Carryforwards [Line Items]                      
Tax credit carryforward amount 17,300,000               17,300,000    
Research Tax Credit Carryforward | State                      
Operating Loss Carryforwards [Line Items]                      
Tax credit carryforward amount $ 3,200,000               $ 3,200,000