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Stock-based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended
--- | --- | --- | ---
Mar. 01, 2021 | Feb. 28, 2021 | Mar. 31, 2021 | Mar. 31, 2020
Additional General Disclosures [Abstract] |  |  |  |
Stock-based compensation expense |  |  | $ 662 | $ 430
Compensation Cost Not yet Recognized [Abstract] |  |  |  |
Unrecognized compensation expense |  |  | $ 2,999 |
Weighted average period of recognition |  |  | 1 year 4 months 17 days |
Accelerated cost |  | $ 173 |  |
Stock Options [Member] |  |  |  |
Number of Stock Options [Abstract] |  |  |  |
Options outstanding (in shares) |  |  | 6,925,478 |
Weighted average exercise price, outstanding (in dollars per share) |  |  | $ 1.83 |
Vested (in shares) |  |  | 4,243,389 |
Exercisable (in shares) |  |  | 4,243,389 |
Number of shares available for issuance (in shares) |  |  | 41,774 |
Stock Options [Member] | Incoming Chief Executive Officer [Member] |  |  |  |
Compensation Cost Not yet Recognized [Abstract] |  |  |  |
Granted (in shares) | 1,632,590 |  |  |
Strike price (in dollars per share) | $ 1.73 |  |  |
Award vesting period | 3 years |  |  |
Expiry period of option | 10 years |  |  |
Aggregate fair value of shares issued | $ 2,103 |  |  |
Stock Options [Member] | Incoming Chief Executive Officer [Member] | Vesting on First Anniversary of Date of Grant [Member] |  |  |  |
Compensation Cost Not yet Recognized [Abstract] |  |  |  |
Granted (in shares) | 544,198 |  |  |
Stock Options [Member] | Incoming Chief Executive Officer [Member] | Vesting Every Three Months Thereafter [Member] |  |  |  |
Compensation Cost Not yet Recognized [Abstract] |  |  |  |
Granted (in shares) | 136,049 |  |  |
Restricted Stock Units [Member] |  |  |  |
Restricted Stock Units [Abstract] |  |  |  |
Restricted stock units vested and unissued (in shares) |  |  | 71,934 |

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