Commitments and Contingencies - Summary of Commitments and Contingencies (Detail)	Jun. 30, 2020 USD ($)
Commitment And Contingencies [Line Items]
2020	$ 1,557,000
2021	4,049,000
2022	1,153,000
2023	13,000
2024	0
Thereafter	0
Total	6,772,000
Key Clinical Research Trial Obligations
Commitment And Contingencies [Line Items]
2020	167,000
2021	2,084,000
2022	0
2023	0
2024	0
Thereafter	0
Total	2,251,000
BLA consulting services
Commitment And Contingencies [Line Items]
2021	458,000
2022	687,000
2023	0
2024	0
Thereafter	0
Total	1,145,000
Statistical analysis and programming consulting services
Commitment And Contingencies [Line Items]
2020	60,000
2021	265,000
2022	0
2023	0
2024	0
Thereafter	0
Total	325,000
Employment Agreements
Commitment And Contingencies [Line Items]
2020	442,000
2021	783,000
2022	466,000
2023	13,000
2024	0
Thereafter	0
Total	1,704,000
Insurance premium financing agreement and commitments
Commitment And Contingencies [Line Items]
2020	888,000
2021	459,000
2022	0
2023	0
2024	0
Thereafter	0
Total	$ 1,347,000