Leases - Additional Information (Detail)	1 Months Ended	3 Months Ended
	Jun. 30, 2018 ft²	Mar. 31, 2020 USD ($) ft² Tranche	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Disclosure Of Leases [Line Items]
Loan facility term		5 years
Operating lease weighted average remaining lease term		5 years
Operating lease weighted average discount rate		12.50%
Operating lease expense		$ 213,000	$ 213,000
Variable lease cost		9,000	9,000
Operating lease payments		215,000	$ 178,000
Finance lease, amortization expense of ROU asset		14,000
Interest expense on finance lease liability		3,000
Finance lease, operating cash flows		2,000
Finance lease, financing cash flows		7,000
Finance lease		$ 87,000		$ 0
Finance lease, weighted average Remaining term		1 year 8 months 12 days
Finance lease, weighted average discount rate, percent		12.50%
Laboratory Equipment [Member]
Disclosure Of Leases [Line Items]
Lease term expiration date		Dec. 18, 2021
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%