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Stockholders' Equity - Stock Options (Details) - USD ($) |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 01, 2021 | Mar. 15, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Number of Options |  |  |  |  |  |  |
Outstanding, beginning balance (in shares) |  |  |  |  | 7,179,375 |  |
Granted (in shares) |  |  |  |  | 490,390 |  |
Canceled (in shares) |  |  |  |  | (8,050) |  |
Exercised (in shares) |  |  |  |  | 92,820 |  |
Expired/Forfeited (in shares) |  |  |  |  | (1,721,070) |  |
Outstanding, ending balance (in shares) |  |  | 5,847,825 |  | 5,847,825 |  | 7,179,375
Exercisable (in shares) |  |  | 1,963,658 |  | 1,963,658 |  |
Weighted Average Exercise Price |  |  |  |  |  |  |
Outstanding, beginning balance (in dollars per share) |  |  |  |  | $ 3.14 |  |
Granted (in dollars per share) |  |  |  |  | 1.88 |  |
Canceled (in dollars per share) |  |  |  |  | 1.86 |  |
Exercised (in dollars per share) |  |  |  |  | 1.76 |  |
Expired/Forfeited (in dollars per share) |  |  |  |  | 5.63 |  |
Outstanding, ending balance (in dollars per share) |  |  | $ 2.33 |  | 2.33 |  | $ 3.14
Exercisable (in dollars per share) |  |  | $ 3.42 |  | $ 3.42 |  |
Other disclosures |  |  |  |  |  |  |
Outstanding Weighted Average Remaining Contractual Life (in Years) |  |  |  |  | 5 years 9 months 10 days |  | 4 years 11 months 4 days
Exercisable Weighted Average Remaining Contractual Life (in Years) |  |  |  |  | 2 years 3 months 29 days |  |
Aggregate Intrinsic Value, Outstanding |  |  | $ 2,792,000 |  | $ 2,792,000 |  | $ 0
Aggregate Intrinsic Value, Exercisable |  |  | 0 |  | 0 |  |
Employee Stock Option |  |  |  |  |  |  |
Other disclosures |  |  |  |  |  |  |
Compensation expense |  |  | 40,000 | $ 45,000 | 198,000 | $ 113,000 |
Unrecognized compensation expense |  |  | $ 151,000 |  | $ 151,000 |  |
Weighted average period of recognition |  |  |  |  | 1 year 1 month 24 days |  |
Employee Stock Option | Employee |  |  |  |  |  |  |
Number of Options |  |  |  |  |  |  |
Granted (in shares) |  | 365,390 |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |
Granted (in dollars per share) |  | $ 1.86 |  |  |  |  |
Employee Stock Option | Non Management Directors |  |  |  |  |  |  |
Number of Options |  |  |  |  |  |  |
Granted (in shares) | 125,000 |  |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |
Granted (in dollars per share) | $ 1.93 |  |  |  |  |  |
Other disclosures |  |  |  |  |  |  |
Vesting percentage per year | 50.00% |  |  |  |  |  |
Employee Stock Option | Five year expiration |  |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |  |
Expiration period |  |  |  |  | 5 years |  |
Employee Stock Option | Seven year expiration |  |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |  |
Expiration period |  |  |  |  | 7 years |  |
Employee Stock Option | Ten year expiration |  |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |  |
Expiration period |  |  |  |  | 10 years |  |

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