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Stockholders' Equity - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 13, 2021 | Jul. 01, 2021 | Apr. 01, 2021 | Mar. 15, 2021 | Dec. 21, 2020 | Sep. 28, 2020 | Aug. 21, 2020 | Apr. 15, 2020 | Apr. 01, 2020 | Mar. 31, 2020 | Mar. 13, 2020 | Feb. 28, 2020 | Jan. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Other disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 720 | $ 850
Employee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 550 | 740
Non Management Directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 170 | $ 110
Employee Stock Option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding, beginning balance (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,179,375 |
Granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 520,390 |
Canceled (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,050 |
Exercised (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99,700 |
Expired/Forfeited (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,961,045) |
Outstanding, ending balance (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,630,970 | 7,179,375
Exercisable (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,757,636 |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding, beginning balance (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.14 |
Granted (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.91 |
Canceled (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.86 |
Exercised (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.77 |
Expired/Forfeited (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.44 |
Outstanding, ending balance (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.25 | $ 3.14
Exercisable (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.28 |
Other disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Weighted Average Remaining Contractual Life (in Years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years 5 months 15 days | 4 years 11 months 4 days
Exercisable Weighted Average Remaining Contractual Life (in Years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year 11 months 26 days |
Aggregate Intrinsic Value, Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0
Aggregate Intrinsic Value, Exercisable |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |
Vested (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 663,223 |
Compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300 | $ 200
Unrecognized compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 |
Weighted average period of recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year 3 months 14 days |
Employee Stock Option | Employee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) | 10,000 |  |  | 365,390 | 25,000 | 15,000 |  |  |  | 50,000 |  | 50,000 |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) | $ 2.00 |  |  | $ 1.86 | $ 1.09 | $ 0.71 |  |  |  | $ 0.61 |  | $ 1.40 |  |  |  |
Other disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested (in shares) |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Award vesting period (in years) |  |  |  |  |  | 3 years |  |  |  | 3 years |  |  |  |  |  |
Vesting percentage per year | 50.00% |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Employee Stock Option | Another Employee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 25,000 |  |  |  |  |  |  |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) |  |  |  |  | $ 1.09 |  |  |  |  |  |  |  |  |  |  |
Other disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period (in years) |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |
Employee Stock Option | Non Management Directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 125,000 |  |  |  |  |  | 200,000 |  |  |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) |  |  | $ 1.93 |  |  |  |  |  | $ 0.50 |  |  |  |  |  |  |
Other disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage per year |  |  | 50.00% |  |  |  |  |  | 50.00% |  |  |  |  |  |  |
Employee Stock Option | Management |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  | 20,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) |  | $ 2.76 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage per year |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Stock Option | Board Observer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000 |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.00 |  |
Other disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage per year |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |
Employee Stock Option | Consultant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  | 22,750 | 13,500 |  |  |  |  | 75,000 |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) |  |  |  |  |  |  | $ 1.00 | $ 3.00 |  |  |  |  | $ 1.57 |  |  |
Other disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of options vested per tranche |  |  |  |  |  |  |  | 33.33% |  |  |  |  |  |  |  |
Employee Stock Option | A certain key employee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  |  |  | 50,000 |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 5.50 |  |  |  |  |
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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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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