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Equity - Stock Options - Activity (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based compensation |  |  |
Outstanding shares, ending balance | 2,131,058 | 880,277 |
Granted (in shares) | 743,161 | 1,328,718 |
Exercised (in shares) | (117,000) |  |
Forfeited/Expired/Exchanged - (in shares) | (60,100) | (77,937) |
Outstanding shares, beginning balance | 2,697,119 | 2,131,058 | 880,277
Exercisable at December 31, Options (in shares) | 2,379,752 | 1,461,073 |
Outstanding - Weighted Average Exercise Price (in dollars per share) | $ 2.53 | $ 4.32 |
Exercise price (in dollars per share) | 1.07 | 1.32 |
Exercised - Weighted Average Exercise Price (in dollars per share) | 1.08 |  |
Forfeited/Expired/Exchanged - Weighted Average Exercise Price (in dollars per share) | 2.88 | 2.11 |
Outstanding - Weighted Average Exercise Price (in dollars per share) | 2.18 | 2.53 | $ 4.32
Exercisable - Weighted Average Exercise Price (in dollars per share) | 2.26 | $ 2.90 |
Vest over the estimated fair value | $ 2.25 |  |
Granted - Weighted Average Remaining Contractual Life (in years) | 9 years 2 months 23 days | 9 years 1 month 28 days |
Stock options, Contractual life (in years) | 7 years 6 months 11 days | 7 years 11 months 27 days | 6 years 5 months 27 days
Stock options, Contractual life (in years) |  | 7 years 11 months 27 days |
Exercisable - Weighted Average Remaining Contractual Life (in years) | 7 years 5 months 23 days | 7 years 6 months 29 days |
Minimum [Member] |  |  |
Share-based compensation |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 1 year |  |
Maximum [Member] |  |  |
Share-based compensation |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |
Equity Incentive Plan [Member] |  |  |
Share-based compensation |  |  |
Granted (in shares) | 743,161 | 1,328,718 |
Exercised (in shares) | (117,000) |  |
Forfeited/Expired/Exchanged - (in shares) | (60,100) | (77,937) |

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