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Summary of Significant Accounting Policies - Additional Information (Detail) |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 19, 2020 $ / shares | Sep. 14, 2020 USD ($) shares | Aug. 08, 2019 $ / shares | Sep. 30, 2020 USD ($) shares | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) Segment shares | Sep. 30, 2019 USD ($) shares | Dec. 31, 2019 USD ($) | Mar. 31, 2020 shares | Dec. 31, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  | $ (6,144,000) | $ (2,893,000) | $ (16,907,000) | $ (11,867,000) |  |  |
Cash and cash equivalents |  |  |  | 114,464,000 | $ 10,814,000 | 114,464,000 | $ 10,814,000 | $ 8,791,000 |  | $ 12,972,000
Working capital |  |  |  | 109,000,000 |  | 109,000,000 |  |  |  |
Accumulated deficit |  |  |  | (74,489,000) |  | $ (74,489,000) |  | (57,582,000) |  |
Closing bid price per NASDAQ listing notification letter | $ / shares |  |  | $ 1.00 |  |  |  |  |  |  |
Consecutive business days for closing bid price of common stock |  |  | 30 days |  |  |  |  |  |  |
Reverse stock split, description |  |  |  |  |  | On October 5, 2020, Novus effected a reverse stock-split of its issued and outstanding common stock and options for common stock at a ratio of one-for-eighteen. The Company filed an Amended and Restated Certificate of Incorporation with the Secretary of State of the State of Delaware effecting the reverse stock-split. The accompanying condensed consolidated financial statements and notes, as well as other share and per-share data herein, give retroactive effect to the reverse stock-split for all periods presented. |  |  |  |
Cash, cash equivalents and restricted cash, maturity period |  |  |  |  |  | three months or less |  |  |  |
Cash equivalents or restricted cash |  |  |  | $ 10,100,000 |  | $ 10,100,000 |  | 0 |  |
Number of operating business segments | Segment |  |  |  |  |  | 1 |  |  |  |
Goodwill impairment |  |  |  |  |  | $ 0 |  | $ 1,900,000 |  |
Impairment of tangible assets |  |  |  |  |  | $ 0 |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount | shares |  |  |  |  |  | 1,828,531 | 487,274 |  |  |
2014 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Increase in number of shares of common stock authorized for issuance | shares |  |  |  |  |  |  |  |  | 518,693 |
Common stock, number of shares reserved for issuance | shares |  |  |  | 421,648 |  | 421,648 |  |  |  |
2014 Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Increase in number of shares of common stock authorized for issuance | shares |  |  |  |  |  |  |  |  | 129,673 |
Common stock, number of shares reserved for issuance | shares |  |  |  | 433,394 |  | 433,394 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of consecutive trading days required to regain compliance | 10 days |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Stock price per share | $ / shares | $ 1.00 |  |  |  |  |  |  |  |  |
Anelixis [Member] | Series X1 Preferred Stock [Member] | Stock Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock shares agreed to sell | shares |  | 199,112 |  |  |  |  |  |  |  |
Preferred stock shares aggregate purchase price |  | $ 99,100,000 |  |  |  |  |  |  |  |
Business combination additional commitments in equity financing |  | $ 9,000,000 |  |  |  |  |  |  |  |
Anelixis [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Shares of common stock issued upon conversion of each share of preferred stock | shares |  | 55.5556 |  |  |  |  |  |  |  |
Anelixis [Member] | Common Stock [Member] | Series X1 Preferred Stock [Member] | Stock Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Shares of common stock issued upon conversion of each share of preferred stock | shares |  | 55.5556 |  |  |  |  |  |  |  |
Otic Pharma [Member] | Anelixis [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 100.00% |  | 100.00% |  |  |  |
Otic Pharma, Inc. [Member] | Anelixis [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 100.00% |  | 100.00% |  |  |  |

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