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Stock-Based Compensation and Stock Options (Details) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Jun. 01, 2021 employee $ / shares shares | May 29, 2020 employee $ / shares shares | Sep. 30, 2019 employee $ / shares shares | May 31, 2019 installment $ / shares shares | Jun. 30, 2018 $ / shares shares | May 31, 2018 $ / shares shares | Oct. 31, 2017 $ / shares shares | Sep. 30, 2015 $ / shares shares | Sep. 30, 2021 USD ($) shares | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) shares | Mar. 31, 2020 USD ($) | Sep. 30, 2021 USD ($) shares | Sep. 30, 2020 USD ($) shares | Dec. 31, 2020 shares | Dec. 31, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total stock-based compensation expense (reversal) | $ |  |  |  |  |  |  |  |  |  |  |  | $ 44 |  |  |  |
Stock Options | Mr. Ralph Bartel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee options granted to purchase shares of common stock (in shares) |  |  |  |  |  |  |  |  | 188,737 |  |  |  |  |  |  |
Net settlement (in shares) |  |  |  |  |  |  |  |  | 112,901 |  |  |  |  |  |  |
Stock Options | September 2015 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee options granted to purchase shares of common stock (in shares) |  |  |  |  |  |  |  |  | 600,000 |  |  |  |  |  |  |
Stock Options | September 2015 Plan | Mr. Ralph Bartel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee options granted to purchase shares of common stock (in shares) |  |  |  |  |  |  |  | 400,000 |  |  |  |  |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 8.07 |  |  |  |  |  |  |  |
Options exercised (in shares) |  |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |  |
Stock Options | October 2017 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee options granted to purchase shares of common stock (in shares) |  |  |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |
Stock Options | October 2017 Plan | Mr. Ralph Bartel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee options granted to purchase shares of common stock (in shares) |  |  |  |  |  |  | 400,000 |  |  |  |  |  |  |  |  | 150,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 6.95 |  |  |  |  |  |  |  |  |
Options exercised (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000
Stock Options | September 2019 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee options granted to purchase shares of common stock (in shares) |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares |  |  | $ 10.79 |  |  |  |  |  |  |  |  |  |  |  |  |
Options vested and become exercisable annually (in shares) |  |  | 75,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Total stock-based compensation expense (reversal) | $ |  |  |  |  |  |  |  |  | $ 97 | $ (362) |  |  | $ 248 | $ 523 |  |
Unrecognized stock-based compensation expense | $ |  |  |  |  |  |  |  |  | 741 |  |  |  | $ 741 |  |  |
Expected duration for recognition of stock based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  | 1 year 10 months 24 days |  |  |
Stock Options | September 2019 Plan | Mr. Ralph Bartel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares |  |  | $ 10.79 |  |  |  |  |  |  |  |  |  |  |  |  |
Options vested and become exercisable annually (in shares) |  |  | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Total stock-based compensation expense (reversal) | $ |  |  |  |  |  |  |  |  | 382 | 382 |  |  | $ 1,100 | 3,900 |  |
Unrecognized stock-based compensation expense | $ |  |  |  |  |  |  |  |  | 382 |  |  |  | $ 382 |  |  |
Expected duration for recognition of stock based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  | 3 months |  |  |
Stock Options | September 2019 Plan | Key Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee options granted to purchase shares of common stock (in shares) |  |  | 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of key employees | employee |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Options | May 2020 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee options granted to purchase shares of common stock (in shares) |  | 100,000 |  |  |  |  |  |  |  |  |  |  | 54,110 |  | 54,258 |
Options forfeited (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 75,000 |  | 100,000 |
Options vested and exercisable in future periods (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  | 75,000 |
Share price (in dollars per share) | $ / shares |  | $ 3.49 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued upon exercise of options (in shares) |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Options | May 2020 Plan | Mr. Ralph Bartel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee options granted to purchase shares of common stock (in shares) |  | 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,900,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares |  | $ 3.49 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total stock-based compensation expense (reversal) | $ |  |  |  |  |  |  |  |  | 385 | 385 |  |  | $ 1,200 | 771 |  |
Unrecognized stock-based compensation expense | $ |  |  |  |  |  |  |  |  | 771 |  |  |  | $ 771 |  |  |
Expected duration for recognition of stock based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  | 6 months |  |  |
Stock Options | May 2020 Plan | Key Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee options granted to purchase shares of common stock (in shares) |  | 200,000 |  |  |  |  |  |  |  |  |  |  | 24,474 |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares |  | $ 3.49 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total stock-based compensation expense (reversal) | $ |  |  |  |  |  |  |  |  | 49 | 59 |  |  | $ 157 | 79 |  |
Unrecognized stock-based compensation expense | $ |  |  |  |  |  |  |  |  | $ 491 |  |  |  | $ 491 |  |  |
Expected duration for recognition of stock based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  | 2 years 6 months |  |  |
Options vested and exercisable in future periods (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 50,000 |  |  |
Number of key employees | employee |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Options | May 2018 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee options granted to purchase shares of common stock (in shares) |  |  |  |  |  | 50,000 |  |  |  |  |  |  |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares |  |  |  |  |  | $ 14.70 |  |  |  |  |  |  |  |  |  |
Total stock-based compensation expense (reversal) | $ |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  | 34 |  |
Options forfeited (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000 |
Stock Options | June 2018 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee options granted to purchase shares of common stock (in shares) |  |  |  |  | 50,000 |  |  |  |  |  |  |  |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares |  |  |  |  | $ 16.65 |  |  |  |  |  |  |  |  |  |  |
Total stock-based compensation expense (reversal) | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (43) |  |
Options forfeited (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,500 |  |
Stock Options | May 2019 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee options granted to purchase shares of common stock (in shares) |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares |  |  |  | $ 19.28 |  |  |  |  |  |  |  |  |  |  |  |
Total stock-based compensation expense (reversal) | $ |  |  |  |  |  |  |  |  |  |  | $ (107) |  |  |  |  |
Options forfeited (in shares) |  |  |  | 75,000 |  |  |  |  |  |  | 75,000 |  |  |  |  |
Number of installments | installment |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |
Options canceled (in shares) |  |  |  |  |  |  |  |  |  |  | 25,000 |  |  |  |  |
Stock Options | May 2019 Plan | September 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options vested and exercisable in future periods (in shares) |  |  |  | 15,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock Options | May 2019 Plan | May 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options vested (in shares) |  |  |  | 10,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock Options | May 2019 Plan | Tranche One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options vested and exercisable in future periods (in shares) |  |  |  | 25,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock Options | May 2019 Plan | Tranche Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options vested and exercisable in future periods (in shares) |  |  |  | 25,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock Options | May 2019 Plan | Tranche Three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options vested and exercisable in future periods (in shares) |  |  |  | 25,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock Options | May 2019 Plan | Mr. Ralph Bartel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee options granted to purchase shares of common stock (in shares) |  |  |  |  |  |  |  |  | 367,086 |  |  |  |  |  |  |
Options exercised (in shares) |  |  |  |  |  |  |  |  | 160,000 |  |  |  |  |  |  |
Stock Options | June 2021 Plan | One Employee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee options granted to purchase shares of common stock (in shares) | 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares | $ 9.44 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total stock-based compensation expense (reversal) | $ |  |  |  |  |  |  |  |  | $ 62 |  |  |  | $ 82 |  |  |
Unrecognized stock-based compensation expense | $ |  |  |  |  |  |  |  |  | $ 492 |  |  |  | $ 492 |  |  |
Expected duration for recognition of stock based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  | 3 years 3 months 18 days |  |  |
Number of key employees | employee | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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