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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Feb. 29, 2020 | Dec. 31, 2020
Stockholders Equity Disclosure [Line Items] |  |  |
Net proceeds from sale of common stock after deducting underwriting commissions and offering expenses payable | $ 28.0 | $ 32.0 |
Underwriting discounts, commissions and offering expenses payable | $ 2.0 | $ 2.5 |
Common Stock |  |  |
Stockholders Equity Disclosure [Line Items] |  |  |
Firm commitment underwritten public offering shares | 4,615,384 | 5,307,692 |
Issuance of stock, shares |  |  | 9,923,076
Common stock price, per share | $ 6.50 | $ 6.50 |
Common Stock | Overallotment Option |  |  |
Stockholders Equity Disclosure [Line Items] |  |  |
Issuance of stock, shares |  | 692,307 |

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