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Summary of Significant Accounting Policies - Additional Information (Detail) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 06, 2020 $ / shares | Aug. 08, 2019 $ / shares | Dec. 31, 2019 USD ($) Segment Reporting_Unit shares | Dec. 31, 2018 USD ($) shares | Jan. 01, 2019 USD ($) | Aug. 01, 2018 shares
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Net loss |  |  | $ (16,011,000) | $ (14,065,000) |  |
Cash used in operating activities |  |  | (13,857,000) | (11,893,000) |  |
Cash and cash equivalents |  |  | 8,791,000 | 12,972,000 |  |
Working capital |  |  | 8,600,000 |  |  |
Accumulated deficit |  |  | $ (57,582,000) | (41,571,000) |  |
Closing bid price per NASDAQ listing notification letter | $ / shares |  | $ 1.00 |  |  |  |
Consecutive business days for closing bid price of common stock |  | 30 days |  |  |  |
Cash, cash equivalents and restricted cash, maturity period |  |  | three months or less |  |  |
Cash equivalents |  |  | $ 0 | 0 |  |
Financial assets transfers level 1 to 2 |  |  | 0 | 0 |  |
Financial assets transfers level 2 to 1 |  |  | 0 | 0 |  |
Financial liabilities transfers level 1 to 2 |  |  | 0 | 0 |  |
Financial liabilities transfers level 2 to 1 |  |  | $ 0 | 0 |  |
Number of operating business segments | Segment |  |  | 1 |  |  |
Number of reporting units | Reporting_Unit |  |  | 1 |  |  |
Impairment charge |  |  | $ 1,867,000 | $ 0 |  |
Impairment of tangible assets |  |  | $ 0 |  |  |
Antidilutive securities excluded from computation of earnings per share, amount | shares |  |  | 8,770,947 | 974,817 |  |
Tax benefit |  |  | $ 0 |  |  |
Income tax examination, likelihood of settlement, description |  |  | The second step is to measure the tax benefit as the largest amount that is more than 50% likely of being realized upon settlement. |  |  |
Income tax examination, likelihood of settlement, percentage |  |  | 50.00% |  |  |
Lease, Practical Expedients, Package [true false] |  |  | true |  |  |
Lease, Practical Expedient, Use of Hindsight [true false] |  |  | false |  |  |
Operating lease right of use asset |  |  | $ 316,000 |  |  |
Operating lease liability |  |  | $ 324,000 |  |  |
ASU 2016-02 [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Operating lease right of use asset |  |  |  |  | $ 489,000 |
Operating lease liability |  |  |  |  | $ 491,000 |
2014 Stock Incentive Plan [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of shares of common stock authorized issuance reduced | shares |  |  |  |  |  | 766,500
Common stock, shares authorized for issuance | shares |  |  | 1,700,000 |  |  | 337,955
2014 Stock Incentive Plan Under Evergreen Provision [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of shares of common stock authorized issuance reduced | shares |  |  |  |  |  | 550,000
2014 Employee Stock Purchase Plan [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Common stock, shares authorized for issuance | shares |  |  | 303,721 |  |  | 209,500
2014 Employee Stock Purchase Plan Under Evergreen Provision [Member] | Maximum [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Common stock, shares authorized for issuance | shares |  |  |  |  |  | 135,000
Fair Value, Measurements, Recurring [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Assets measured at fair value |  |  | $ 0 | $ 0 |  |
Liabilities measured at fair value |  |  | $ 0 | $ 0 |  |
Subsequent Event [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Closing bid price per NASDAQ listing notification letter | $ / shares | $ 1.00 |  |  |  |  |
Consecutive business days for closing bid price of common stock | 10 days |  |  |  |  |
Stock market granted additional calendar days | 180 days |  |  |  |  |
Otic Pharma [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Ownership percentage |  |  | 100.00% |  |  |
Otic Pharma, Inc. [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Ownership percentage |  |  | 100.00% |  |  |

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