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Commitments and Contingencies - Additional Information (Details)
 3 Months Ended 9 Months Ended
Sep. 22, 2020
ft²
Jul. 27, 2020
USD ($)
Jul. 02, 2020
USD ($)
Jul. 01, 2020
USD ($)
ft²
Jun. 25, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Loss Contingencies [Line Items]              
Lease, description             (i) the 2014 Sublease and 2015 Sublease were extended from May 31, 2020 to August 2, 2021, (ii) effective July 1, 2020, the leased premises under the 2015 Sublease would be expanded to include an additional 4,999 square feet of space, and (iii) effective July 1, 2020, the rent under the 2015 Sublease would increase from approximately $14.6 per month to $20.6 per month.
Extension of sublease       May 31, 2020 to August 2, 2021      
Lease term           12 months 12 months
Operating or finance lease         $ 0   $ 374,000
Sub lease expiration date Feb. 28, 2023            
Sublease 2015 [Member]              
Loss Contingencies [Line Items]              
Additional area of space | ft²       4,999      
Increase in sublease rent     $ 20,600,000 $ 14,600,000      
2021 Sub-Lease Agreement [Member]              
Loss Contingencies [Line Items]              
Additional area of space | ft² 6,877            
Sublease rent         $ 3,700 $ 405,700  
Lease term         5 years    
Pending Litigation [Member]              
Loss Contingencies [Line Items]              
Unpaid compensation amounts claimed   $ 1,140,000          
Accrued unpaid compensation amounts           $ 1,140,000 $ 1,140,000