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Commitments and Contingencies - Additional Information (Detail) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) | Apr. 30, 2018 | Dec. 31, 2015 USD ($) | Nov. 30, 2015 USD ($) shares | Sep. 30, 2015 ft² | Dec. 31, 2019 USD ($) Milestone | Dec. 31, 2018 USD ($) Milestone
Other Commitments [Line Items] |  |  |  |  |  |  |
Rental expense |  |  |  |  |  | $ 188,000 | $ 170,000
Remaining term of office lease |  |  |  |  |  | 1 year 9 months |
Debt outstanding |  |  |  |  |  | $ 0 |
Number of milestones achieved | Milestone |  |  |  |  |  | 0 | 0
Indemnification obligations amount |  |  |  |  |  | $ 0 |
Contingent liabilities |  |  |  |  |  | $ 0 | $ 0
Research and Development Expenses [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Milestone payment | $ 300,000 |  |  |  |  |  |
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 |  |  |
Three-year Operating Lease [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Operating lease expiration term |  |  |  |  | 3 years |  |
Area of office space | ft² |  |  |  |  | 5,197 |  |
Leases expiration date |  |  |  |  | Aug. 31, 2018 |  |
Leases extension date |  | Sep. 30, 2021 |  |  |  |  |

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