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Stockholders' Equity - At-the-Market Offering - Additional Information (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 18, 2020 | Dec. 31, 2020 | May 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Stockholders Equity Note [Line Items] |  |  |  |  |
Gross proceeds from issuance of common stock |  |  |  | $ 230,000 |
Issuance costs |  | $ 1,861,000 | $ 2,618,000 | $ 1,000 | $ 0
Cantor Fitzgerald & Co [Member] |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Percentage of commission on aggregate gross proceeds | 3.00% |  |  |  |
Cantor Fitzgerald & Co [Member] | At-the-Market Offering [Member] |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Shares issued in public offering |  |  |  | 77,644 |
Gross proceeds from issuance of common stock |  |  |  | $ 910,000 |
Issuance costs |  |  |  | $ 44,000 |
Roth Capital Partners L L C |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Percentage of fee on gross sale price per share | 1.05% |  |  |  |
Percentage of underwriting fee to be received on company offerings | 35.00% |  |  |  |
Common stock offering period | 90 days |  |  |  |
Maximum [Member] | Cantor Fitzgerald & Co [Member] |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
At-the-market offering, aggregate offering price | $ 10,000,000 |  |  |  |
Legal fees and disbursements | $ 50,000 |  |  |  |

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