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Equity - Stock Options - Non-vested (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Share-based compensation |  |
Non-vested stock options at January 1 (in shares) | 669,985 | 292,315
Granted (in shares) | 743,161 | 1,328,718
Vested, Options (in shares) | (1,077,655) | (902,268)
Exercised (in shares) | (117,000) |
Forfeited/Expired/Exchanged, Options (in shares) | (18,124) | (48,780)
Non-vested stock options at December 31 (in shares) | 317,367 | 669,985
Non-vested stock options - Weighted Average Grant Date Fair Value (in dollars per share) | $ 1.71 | $ 2.61
Granted - Weighted Average Grant Date Fair Value (in dollars per share) | 1.07 | 1.32
Vested - Weighted Average Grant Date Fair Value (in dollars per share) | 2.25 | 1.40
Forfeited/Expired/Exchanged - Weighted Average Grant Date Fair Value (in dollars per share) | 2.41 | 2.14
Non-vested stock options - Weighted Average Grant Date Fair Value (in dollars per share) | $ 1.60 | $ 1.71
Stock options, Intrinsic value of outstanding shares | $ 2,966,000 |
Equity Incentive Plan [Member] |  |
Share-based compensation |  |
Granted (in shares) | 743,161 | 1,328,718
Exercised (in shares) | (117,000) |

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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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