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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Tax Credit Carryforward [Line Items] |  |
Federal Income tax rate | 21.00% | 21.00%
Net valuation allowance increased | $ 3,000,000 |
Research and development tax credit carryforwards for federal and state | $ 506,000 | $ 299,000
Period for which cumulative change in ownership annual use net operating loss and research and development credit carryforwards | 3 years |
Accrued interest and penalties associated with uncertain tax positions | $ 0 | 0
Interest or penalties recorded during the year | $ 0 | 0
Minimum [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Percentage of cumulative change in ownership | 50.00% |
Domestic Tax Authority [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Federal net operating loss carryforwards | $ 38,600,000 | 25,000,000
Net operating loss carryforward expiration period | 2034 |
Federal net operating loss carryforwards, not to expiration | $ 13,600,000 | 12,500,000
Research and development tax credit carryforwards for federal and state | $ 764,000 | 420,000
Research and development tax credit carryforwards expiration period | 2025 |
State and Local Jurisdiction [Member] |  |
Tax Credit Carryforward [Line Items] |  |
State net operating loss carryforwards | $ 900,000 | 900,000
Research and development tax credit carryforwards for federal and state | $ 264,000 | $ 161,000
Research and development tax credit carryforwards expiration description | As of December 31, 2019 and 2018, the Company has state research and development credit carryforwards or approximately $264,000 and $161,000, respectively, which do not expire. |
Israeli Tax Authority [Member] | Foreign Country [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Income tax rate | 23.00% | 23.00%
Foreign operating losses carryforwards | $ 8,000,000 | $ 8,200,000
California [Member] | State and Local Jurisdiction [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Net operating loss carryforward expiration period | 2034 |

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