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Stock-Based Compensation and Stock Options (Details) - Stock Options $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
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May 31, 2019 installment $ / shares shares | Jun. 30, 2018 $ / shares shares | May 31, 2018 $ / shares shares | Apr. 30, 2018 installment $ / shares shares | Oct. 31, 2017 $ / shares shares | Mar. 31, 2016 $ / shares shares | Sep. 30, 2015 $ / shares shares | Jan. 31, 2012 $ / shares shares | Mar. 31, 2020 USD ($) shares | Mar. 31, 2019 USD ($) shares | Dec. 31, 2019 shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2014 shares
January 2012 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 |  |  |  |  |  |  |  | $ 28.98 |  |  |  |  |  |
Options vested and become exercisable annually (in shares) |  |  |  |  |  |  |  | 25,000 |  |  |  |  |  |
Options canceled (in shares) |  |  |  |  |  |  |  |  |  |  | 50,000 |  |  | 25,000
Options forfeited (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000
September 2015 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 vested and become exercisable quarterly (in shares) |  |  |  |  |  |  | 50,000 |  |  |  |  |  |  |
Options vested (in shares) |  |  |  |  |  |  |  |  | 400,000 |  |  |  |  |
Options outstanding (in shares) |  |  |  |  |  |  |  |  | 400,000 |  |  |  |  |
March 2016 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee options granted to purchase shares of common stock (in shares) |  |  |  |  |  | 150,000 |  |  |  |  |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares |  |  |  |  |  | $ 8.55 |  |  |  |  |  |  |  |
Options vested and become exercisable annually (in shares) |  |  |  |  |  | 37,500 |  |  |  |  |  |  |  |
Options canceled (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 12,500 |
Options forfeited (in shares) |  |  |  |  |  |  |  |  |  |  |  | 50,000 | 37,500 |
Total stock-based compensation expense | $ |  |  |  |  |  |  |  |  |  |  |  | $ (59) | $ (19) |
Options exercised (in shares) |  |  |  |  |  |  |  |  |  |  | 50,000 |  |  |
Shares issued upon exercise of options (in shares) |  |  |  |  |  |  |  |  |  |  | 4,000 |  |  |
October 2017 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  | $ 6.95 |  |  |  |  |  |  |  |  |
Options vested and become exercisable quarterly (in shares) |  |  |  |  | 50,000 |  |  |  |  |  |  |  |  |
Total stock-based compensation expense | $ |  |  |  |  |  |  |  |  |  | $ 143 |  |  |  |
Options exercised (in shares) |  |  |  |  |  |  |  |  |  |  | 250,000 |  |  |
Options outstanding (in shares) |  |  |  |  |  |  |  |  | 150,000 |  |  |  |  |
April 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 |  |  |  | $ 10.50 |  |  |  |  |  |  |  |  |  |
Options canceled (in shares) |  |  |  |  |  |  |  |  |  | 50,000 |  |  |  |
Total stock-based compensation expense | $ |  |  |  |  |  |  |  |  |  | $ 34 |  |  |  |
Number of installments | installment |  |  |  | 12 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
Options vested and become exercisable annually (in shares) |  |  | 12,500 |  |  |  |  |  |  |  |  |  |  |
Options vested (in shares) |  |  |  |  |  |  |  |  | 12,500 |  |  |  |  |
Total stock-based compensation expense | $ |  |  |  |  |  |  |  |  | $ 22 | $ 22 |  |  |  |
Options outstanding (in shares) |  |  |  |  |  |  |  |  | 50,000 |  |  |  |  |
Unrecognized stock-based compensation expense | $ |  |  |  |  |  |  |  |  | $ 190 |  |  |  |  |
Expected duration for recognition of stock based compensation expense (in years) |  |  |  |  |  |  |  |  | 2 years 1 month 13 days |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
Options vested and become exercisable annually (in shares) |  | 12,500 |  |  |  |  |  |  |  |  |  |  |  |
Options forfeited (in shares) |  |  |  |  |  |  |  |  | 37,500 |  |  |  |  |
Total stock-based compensation expense | $ |  |  |  |  |  |  |  |  | $ (43) |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |
Options vested (in shares) | 10,000 |  |  |  |  |  |  |  | 25,000 |  |  |  |  |
Total stock-based compensation expense | $ |  |  |  |  |  |  |  |  | $ 44 |  |  |  |  |
Number of installments | installment | 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized stock-based compensation expense | $ |  |  |  |  |  |  |  |  | $ 551 |  |  |  |  |
Expected duration for recognition of stock based compensation expense (in years) |  |  |  |  |  |  |  |  | 3 years 1 month 19 days |  |  |  |  |
September 2019 | May 2019 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options vested and exercisable in future periods (in shares) | 15,000 |  |  |  |  |  |  |  |  |  |  |  |  |
May 20, 2021 | May 2019 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options vested and exercisable in future periods (in shares) | 75,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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