Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Leases (Details)

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Commitments and Contingencies - Leases (Details) - Chesterbrook, Pennsylvania
9 Months Ended
Oct. 02, 2020
Oct. 11, 2018
ft²
Sep. 30, 2021
ft²
$ / ft²
Leases      
Number of square feet of space leased on the first floor     8,231
Number of square feet of space leased on the second floor     40,565
Sublease Agreements | Vanguard Group, Inc      
Leases      
Number of square feet of space being subleased on second floor   40,565  
Initial term of sublease   37 months  
Term of optional sublease extension 3 years    
Term of second optional sublease extension     3 years
Amount per square foot less for rent during months 2 to 13 | $ / ft²     0.50
Amount per square foot for rent after month 14 | $ / ft²     1.00