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Stockholders' Equity - Stock Options (Details) $ / shares in Units, $ in Millions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 21, 2020 employee $ / shares shares | Sep. 28, 2020 $ / shares shares | Aug. 21, 2020 $ / shares shares | Apr. 15, 2020 $ / shares shares | Apr. 01, 2020 $ / shares shares | Mar. 31, 2020 $ / shares shares | Mar. 13, 2020 $ / shares shares | Feb. 28, 2020 $ / shares shares | Jan. 31, 2020 $ / shares shares | Jan. 01, 2020 $ / shares shares | Dec. 31, 2019 $ / shares shares | Oct. 31, 2019 $ / shares | Oct. 01, 2019 $ / shares | Sep. 01, 2019 $ / shares | May 01, 2019 | Apr. 15, 2019 $ / shares | Apr. 01, 2019 $ / shares | Feb. 27, 2019 $ / shares shares | Jan. 01, 2019 $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares
Number of Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding, beginning balance (in shares) |  |  |  |  |  |  |  |  |  | 7,222,625 |  |  |  |  |  |  |  |  |  | 7,222,625 |
Granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 531,250 |
Expired/Forfeited (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (574,500) |
Outstanding, ending balance (in shares) |  |  |  |  |  |  |  |  |  |  | 7,222,625 |  |  |  |  |  |  |  |  | 7,179,375 | 7,222,625
Exercisable (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,063,208 |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding, beginning balance (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 3.33 |  |  |  |  |  |  |  |  |  | $ 3.33 |
Granted (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.40 |
Expired/Forfeited (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.94 |
Outstanding, ending balance (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 3.33 |  |  |  |  |  |  |  |  | 3.14 | $ 3.33
Exercisable (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.91 |
Other disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Weighted Average Remaining Contractual Life (in Years) |  |  |  |  |  |  |  |  |  |  | 5 years 9 months 26 days |  |  |  |  |  |  |  |  | 4 years 11 months 5 days |
Exercisable Weighted Average Remaining Contractual Life (in Years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year 2 months 19 days |
Vested (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 444,083 |
Number of employees to whom awards granted | employee | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.2 | $ 0.5
Unrecognized compensation expense | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.2 |
Weighted average period of recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year 22 days |
Board Observer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  |  | 5,000 |  |  |  |  |  |  |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 4.00 |  |  |  |  |  |  |  |  |  |  |
Other disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of options vested per tranche |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Consultant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 22,750 | 13,500 |  |  |  |  | 75,000 |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) | $ / shares |  |  | $ 1.00 | $ 3.00 |  |  |  |  | $ 1.57 |  |  |  |  |  |  |  |  |  |  |  |
Other disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of options vested per tranche |  |  |  | 33.33% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) | 50,000 | 15,000 |  |  |  | 50,000 |  | 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) | $ / shares | $ 1.09 | $ 0.71 |  |  |  | $ 0.61 |  | $ 1.40 |  |  |  |  |  |  |  |  |  |  |  |  |
Other disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of options vested per tranche | 50.00% | 33.33% |  |  |  | 33.33% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
A certain key employee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  | 50,000 |  |  |  |  |  |  |  |  |  |  |  | 250,000 |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 5.50 |  |  |  |  |  |  |  |  |  |  |  | $ 3.00 |  |
Other disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |
Non Management Directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) | $ / shares |  |  |  |  | $ 0.50 |  |  |  |  |  |  |  |  |  |  |  | $ 1.70 |  |  |  |
Other disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of options vested per tranche |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |
Key Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 1.72 | $ 1.77 | $ 1.59 |  | $ 1.40 | $ 1.38 |  |  |  |
Other disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of options vested per tranche |  |  |  |  |  |  |  |  |  |  |  | 33.33% | 33.33% | 33.33% | 50.00% | 50.00% |  |  |  |  |
Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,578,947 |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.70 |  |  |
Chief Financial Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 552,632 |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.70 |  |  |
Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 368,421 |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.70 |  |  |
Five year expiration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |
Seven year expiration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years |
Ten year expiration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |

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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, 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 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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