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Share-Based Compensation - Stock Option Activity - Textual (Details) |  |  |  |  | 12 Months Ended
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Jun. 28, 2019 $ / shares shares | Jun. 25, 2019 board_of_director $ / shares shares | Mar. 07, 2019 $ / shares shares | Jan. 02, 2019 $ / shares shares | Dec. 31, 2019 $ / shares shares | Dec. 31, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 1,089,000 | 1,120,500
Weighted average exercise price, granted (USD per share) | $ / shares |  |  |  |  | $ 2.26 | $ 1.44
Number of board of directors | board_of_director |  | 3 |  |  |  |
Exercise of stock options (in shares) |  |  |  |  | 781,500 | 30,000
Price per share (in usd per share) | $ / shares |  |  |  |  | $ 1.60 | $ 0.15
Exercise of stock options, net (in shares) |  |  |  |  | 440,000 |
Exercise of stock options, common stock (in shares) |  |  |  |  | 304,171 |
Exercise of stock options, forfeited (in shares) |  |  |  |  | 135,829 |
Exercise of stock options, cash (in shares) |  |  |  |  | 341,500 |
Executives and Key Personnel |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted average exercise price, granted (USD per share) | $ / shares |  |  |  | $ 1.87 |  |
Award requisite service period |  |  |  | 1 year |  |
Board of Directors |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted (in shares) |  |  |  | 300,000 |  |
Weighted average exercise price, granted (USD per share) | $ / shares |  | $ 5.83 |  | $ 1.87 |  |
Award requisite service period |  | 1 year |  |  |  |
Employee |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted (in shares) |  |  |  | 24,000 |  |
Weighted average exercise price, granted (USD per share) | $ / shares |  |  |  | $ 1.87 |  |
Contractor |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted average exercise price, granted (USD per share) | $ / shares |  |  | $ 3 | $ 1.87 |  |
Award requisite service period |  |  | 1 year | 1 year |  |
Chief Financial Officer |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted average exercise price, granted (USD per share) | $ / shares | $ 6.26 |  |  |  |  |
Stock Option | Executives and Key Personnel |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted (in shares) |  |  |  | 600,000 |  |
Stock Option | Board of Directors |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares available for grant (in shares) |  | 75,000 |  |  |  |
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] |  |  |  |  |  |
Sign on, vesting period |  |  |  | 4 years |  |
Percentage of options that will vest |  |  |  | 75.00% |  |
Stock Option | Employee |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Sign on, vesting period |  |  |  | 4 years |  |
Stock Option | Contractor |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares available for grant (in shares) |  |  | 15,000 | 50,000 |  |
Stock Option | Chief Financial Officer |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares available for grant (in shares) | 25,000 |  |  |  |  |

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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 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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