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Stockholders' Equity - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 18, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Dec. 31, 2020
Stockholders Equity [Line Items] |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  | 5,000,000 | 5,000,000 |  | 5,000,000 | 5,000,000
Common stock, shares authorized |  |  | 200,000,000 | 200,000,000 |  | 200,000,000 | 200,000,000
Common stock, par or stated value per share |  |  | $ 0.001 | $ 0.001 |  | $ 0.001 | $ 0.001
Estimated commissions and allocated fees |  |  |  | $ 89,000 | $ 42,000 |  |
ATM Sales Agreement [Member] |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |
Aggregate offering price of common stock which may issue and sell under agreement |  | $ 12,000,000.0 |  |  |  |  |
Sale of stock during the period |  |  | 1,365,871 | 2,733,492 |  | 3,421,368 |
Proceeds from issuance of common stock |  |  | $ 3,000,000.0 | $ 7,400,000 |  | $ 10,600,000 |
Estimated commissions and allocated fees |  |  | $ 200,000 | $ 600,000 |  | $ 800,000 |
Common Stock Purchase Agreement [Member] | Lincoln Park Capital Fund, LLC [Member] |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |
Shares agreed to be issued over period under equity line financing | 24 months |  |  |  |  |  |
Issuance of common stock to Lincoln Park Capital Fund, shares | 170,088 |  |  |  |  |  |
Common Stock Purchase Agreement [Member] | Lincoln Park Capital Fund, LLC [Member] | Maximum [Member] |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |
Shares agreed to be issued under equity line financing | 15.0 |  |  |  |  |  |

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