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Commitments and Contingencies - Additional Information (Detail)	1 Months Ended			3 Months Ended
	Mar. 31, 2019 USD ($)	Dec. 31, 2015 USD ($)	Nov. 30, 2015 USD ($) shares	Mar. 31, 2020 USD ($) ft² Milestone	Mar. 31, 2019 USD ($)
Other Commitments [Line Items]
Rental expense				$ 47,000	$ 49,000
Area of office space \| ft²				5,197
Lease expiration date				Sep. 30, 2021
Remaining term of office lease				1 year 6 months
Debt outstanding				$ 0
Number of milestones achieved \| Milestone				0
Milestone payment	$ 300,000
Indemnification obligations amount				$ 0
Contingent liabilities				$ 0
License Agreement [Member]
Other Commitments [Line Items]
Sales based milestone payment		$ 36,000,000
Royalty payment period		8 years
License Agreement [Member] \| Maximum [Member]
Other Commitments [Line Items]
Development and regulatory milestone payments		$ 42,100,000
License Agreement [Member] \| Minimum [Member]
Other Commitments [Line Items]
Sales required to achieve milestone payment		1,000,000,000
Office of Chief Scientist of Israeli Ministry of Economy and Industry [Member]
Other Commitments [Line Items]
Grants received		$ 537,000
Scientific Development and Research, Inc. and Otodyne, Inc. [Member] \| License Agreement [Member]
Other Commitments [Line Items]
License fees paid			$ 750,000
Share issued as consideration \| shares			9,780