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Leases - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Jun. 30, 2018
ft²
Dec. 31, 2019
USD ($)
ft²
Tranche
Disclosure Of Leases [Line Items]    
Loan facility term   5 years
Operating lease weighted average remaining lease term   5 years 2 months 12 days
Operating lease weighted average discount rate   12.50%
Operating lease expense   $ 852,000
Variable lease cost   36,000
Operating lease payments   $ 808,000
Caladrius [Member]    
Disclosure Of Leases [Line Items]    
Additional subleased property office area | ft² 1,381  
Basking Ridge Office Space [Member]    
Disclosure Of Leases [Line Items]    
Number of renewal options | Tranche   2
Massachusetts [Member] | Maximum [Member]    
Disclosure Of Leases [Line Items]    
Construction allowance   $ 670,750
Massachusetts [Member] | Original Lease [Member]    
Disclosure Of Leases [Line Items]    
Area of leased office and laboratory space | ft²   13,650
Original lease term   5 years
Lease term expiration date   Apr. 30, 2019
Massachusetts [Member] | Second Amendment Lease [Member]    
Disclosure Of Leases [Line Items]    
Lease term expiration date   May 31, 2025
Lease commencement date   Sep. 10, 2018
Additional lease renewal option period   5 years
Additional Space leased | ft²   6,590
Irrevocable standby letter of credit   $ 150,000
NEW JERSEY | Basking Ridge Office Space [Member]    
Disclosure Of Leases [Line Items]    
Lease term expiration date   Jun. 30, 2022
Lease commencement date   Jul. 31, 2017
Additional lease renewal option period   5 years
Area of leased office space | ft²   3,000
Lease renewal rate at 95% of market rent at time of renewal   95.00%