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Liquidity and Going Concern Uncertainty - Issuance Pursuant to Prospectus (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020
Line of Credit Facility [Line Items] |  |  |
Issuance costs | $ 896 |  |
Proceeds from stock issuance, net of issuance costs | $ 11,504 | $ 11,504 | $ 0
Public Offering |  |  |
Line of Credit Facility [Line Items] |  |  |
Sale of stock, price per share (in dollars per share) | $ 4.00 | $ 4.00 |
Common Stock | Private Placement |  |  |
Line of Credit Facility [Line Items] |  |  |
Sale of stock, price per share (in dollars per share) | $ 4.40 | 4.40 |
Proceeds from issuance of common stock gross | $ 12,400 |  |
Common Stock | Public Offering |  |  |
Line of Credit Facility [Line Items] |  |  |
Number of shares closed in transaction (in shares) | 4,000,000 |  |
Sale of stock, price per share (in dollars per share) | $ 4.00 | 4.00 |
Warrants | Private Placement |  |  |
Line of Credit Facility [Line Items] |  |  |
Number of shares closed in transaction (in shares) | 3,000,000 |  |
Sale of stock, price per share (in dollars per share) | $ 4.40 | $ 4.40 |
Warrants | Public Offering |  |  |
Line of Credit Facility [Line Items] |  |  |
Number of shares closed in transaction (in shares) | 1,000,000 |  |

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