Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Details)

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Income Taxes - Additional Information (Details) - USD ($)
 1 Months Ended 12 Months Ended
Apr. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2017
Operating Loss Carryforwards [Line Items]        
Income tax benefit   $ 3,148,000 $ 0  
Loss before taxes   $ 58,333,000 $ 53,710,000  
Corporate income tax rate   21.00% 21.00%  
Temporary expensing for certain business assets and property, percent   100.00%    
Maximum deduction percentage of pre-NOL taxable income   80.00%    
Unrecognized tax benefits that would impact effective tax rate   $ 0    
Significant change in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit   0    
Income tax examination, penalties and interest accrued   $ 0    
Maximum        
Operating Loss Carryforwards [Line Items]        
Corporate income tax rate   21.00%   35.00%
Federal        
Operating Loss Carryforwards [Line Items]        
Net operating loss carryforward   $ 294,400,000 $ 242,400,000  
Tax credit carryforward   5,300,000    
NOLs subject to expiration   169,600,000    
NOLs subject not to expiration   $ 52,000,000.0 47,500,000  
NOLs expiration date   Dec. 31, 2037    
Net operating loss carryforwards expiration year   2022    
State        
Operating Loss Carryforwards [Line Items]        
Net operating loss carryforward   $ 202,700,000 $ 178,200,000  
Net operating loss carryforwards expiration year   2019    
State | New Jersey        
Operating Loss Carryforwards [Line Items]        
Cash receipt from the sale of state NOLs $ 3,100,000      
Maximum selling value of unused net operating losses and research and development tax credit to profitable tax payers.   $ 20,000,000.0    
Amount received from the program   $ 9,900,000