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Stockholders' Equity (Deficit) - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Class of Stock [Line Items] |  |
Net proceeds from stock issuance |  | $ 3,505
Exercise of warrants | $ 2,279 |
Common Stock and Employee Stock Purchase Plan [Member] |  |
Class of Stock [Line Items] |  |
Shares issued in connection with stock option exercise | 608,886 | 111,427
JMP Securities [Member] |  |
Class of Stock [Line Items] |  |
Maximum aggregate sales price of shares to be issued under sale agreement | $ 50,000 |
Net proceeds from stock issuance | 2,984 |
Common Stock [Member] |  |
Class of Stock [Line Items] |  |
Common stock shares issued |  | 1,292,208
Exercise of warrants | $ 2,279 |
Exercise of warrants issued, shares for cash consideration | 167,495 |
Aggregate exercise of warrants issued, shares | 84,723 |
Issued warrants to purchase shares upon exercises | 91,833 |
Shares issued to outside service provider, shares | 15,828 |
Common Stock [Member] | JMP Securities [Member] |  |
Class of Stock [Line Items] |  |
Common stock shares issued | 1,292,208 |
Stock issuance costs | $ 92 |

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