Leases - Additional Information (Detail)		1 Months Ended	3 Months Ended			9 Months Ended
	Apr. 05, 2021 ft²	Jun. 30, 2018 ft²	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Mar. 31, 2020 USD ($) ft²	Sep. 30, 2021 USD ($) ft² Tranche Lease	Sep. 30, 2020 USD ($)
Disclosure Of Leases [Line Items]
Loan facility term						5 years
Operating lease weighted average remaining lease term			3 years 7 months 6 days			3 years 7 months 6 days
Operating lease weighted average discount rate			12.48%			12.48%
Operating lease expense			$ 229,000	$ 213,000		$ 656,000	$ 640,000
Variable lease cost			9,000	9,000		27,000	27,000
Operating lease payments			236,000	216,000		$ 678,000	646,000
Number of finance leases | Lease						3
Finance lease, amortization expense of ROU asset			46,000	13,000		$ 108,000	39,000
Interest expense on finance lease liability			7,000	2,000		17,000	7,000
Finance lease, operating cash flows			7,000	2,000		17,000	7,000
Finance lease, financing cash flows			$ 45,000	$ 15,000		$ 102,000	$ 35,000
Finance lease, weighted average Remaining term			1 year 4 months 24 days			1 year 4 months 24 days
Finance lease, weighted average discount rate, percent			12.50%			12.50%
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
First Lab Equipment [Member]
Disclosure Of Leases [Line Items]
Lease expiration month year						2021-12
Second Lab Equipment [Member]
Disclosure Of Leases [Line Items]
Lease expiration month year						2022-12
Third Lab Equipment [Member]
Disclosure Of Leases [Line Items]
Lease expiration month year						2023-06
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 expiration month year					2019-04
Massachusetts [Member] | Second Amendment Lease [Member]
Disclosure Of Leases [Line Items]
Lease commencement date					Sep. 10, 2018
Additional lease renewal option period					5 years
Lease term expiration date					May 31, 2025
Additional Space leased | ft²					6,590
Irrevocable standby letter of credit					$ 150,000
Massachusetts [Member] | Third Amendment Lease [Member]
Disclosure Of Leases [Line Items]
Area of leased office and laboratory space | ft²	1,409
Lease commencement date	Jul. 01, 2021
Lease term expiration date					May 31, 2025
NEW JERSEY | Basking Ridge Office Space [Member]
Disclosure Of Leases [Line Items]
Lease expiration month year						2022-06
Additional lease renewal option period			5 years			5 years
Area of leased office space | ft²						3,000
Lease inception month year						2017-07
Lease renewal rate at 95% of market rent at time of renewal						95.00%