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Share-Based Compensation - Stock Option Activity - Textual (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 1 Months Ended | 12 Months Ended
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Nov. 16, 2018 | Mar. 22, 2018 | Mar. 18, 2018 | Jan. 02, 2018 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Options granted (in shares) |  |  |  |  |  | 1,120,500 |  | 660,557
Weighted average exercise price, granted (USD per share) |  |  |  |  |  | $ 1.44 |  | $ 1.61
Exercise of stock options (in shares) |  |  |  |  |  | 30,000 | 6,250 | 6,250
Executives and Key Personnel |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Options granted (in shares) |  |  |  | 492,000 |  |  |  |
Weighted average exercise price, granted (USD per share) |  |  |  | $ 1.39 |  |  |  |
Award requisite service period |  |  |  | 1 year |  |  |  |
Board of Directors |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Options granted (in shares) |  |  |  | 250,000 |  |  |  |
Weighted average exercise price, granted (USD per share) |  |  |  | $ 1.39 |  |  |  |
Employee |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Options granted (in shares) | 16,000 |  |  |  |  |  |  |
Weighted average exercise price, granted (USD per share) | $ 1.76 |  |  | $ 1.39 |  |  |  |
Exercise of stock options (in shares) |  |  |  | 87,500 |  |  |  |
Key Personnel |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Options granted (in shares) |  |  | 50,000 |  |  |  |  |
Weighted average exercise price, granted (USD per share) |  |  | $ 1.44 |  |  |  |  |
Chief Accounting Officer |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Weighted average exercise price, granted (USD per share) | $ 1.76 |  | $ 1.44 |  |  |  |  |
Number of shares available for grant (in shares) |  |  | 50,000 |  |  |  |  |
Stock Option | Board of Directors | Share-based Compensation Award, Tranche One |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Percentage of options that will vest |  |  |  | 25.00% |  |  |  |
Stock Option | Board of Directors | Share-based Compensation Award, Tranche Two through Five |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Percentage of options that will vest |  |  |  | 75.00% |  |  |  |
Award vesting period |  |  |  | 4 years |  |  |  |
Stock Option | Employee |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period |  |  |  | 4 years |  |  |  |
One-time, vesting period | 4 years |  |  |  |  |  |  |
Stock Option | Key Personnel |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award requisite service period |  |  | 1 year |  |  |  |  |
Stock Option | Chief Accounting Officer |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares available for grant (in shares) | 125,000 |  | 50,000 |  |  |  |  |
Stock Option | Former Chief Financial Officer |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Incremental cost from modification of terms |  | $ 39 |  |  |  |  |  |
Stock Option, Sign-On Award | Chief Accounting Officer |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Options granted (in shares) |  |  |  |  | 50,000 |  |  |
Award vesting period |  |  | 4 years |  | 4 years |  |  |

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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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=109197908&loc=d3e5070-113901 + Details
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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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- Definition An excess of the fair value of the modified award over the fair value of the award immediately before the modification. + 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 (h)(2)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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