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Stockholders' Equity - Option activity and Unrecognized expense (Details) - Options - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Options rollforward |  |  |
Options, Outstanding, Number, Beginning Balance | 1,241,675 | 1,241,675 |
Options granted | 0 | 0 |
Options, Outstanding, Number, Ending Balance | 1,241,675 | 1,241,675 | 1,241,675
Options vested and exercisable, Ending Balance | 388,022 |  |
Options exercise price |  |  |
Weighted Average Exercise Price, Beginning | $ 5.73 | $ 5.73 |
Weighted Average Exercise Price, Options granted | 0.00 | 0.00 |
Weighted Average Exercise Price, Ending | 5.73 | $ 5.73 | $ 5.73
Weighted Average Exercise Price, Options vested and exercisable | $ 5.73 |  |
Weighted Average Remaining Contractual Life, Options outstanding (in years) | 7 years 3 months 22 days | 8 years 3 months 22 days | 9 years 3 months 22 days
Weighted Average Remaining Contractual Life, Options vested and exercisable (in years) | 7 years 3 months 22 days |  |
Unrecognized share-based compensation | $ 0.7 |  |
Unrecognized compensation recognition period | 1 year 2 months 12 days |  |
Estimated forfeiture rate, options (as a percent) | 0.00% |  |

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock 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=116856206&loc=d3e5070-113901 + Details
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