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Equity - Equity Incentive Plan (Details) - shares |  | 12 Months Ended
--- | --- | ---
May 08, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Share-based compensation |  |  |
Grants of stock options (in shares) |  | (1,328,718) | (224,000)
Stock option forfeitures (in shares) |  | 77,937 | 337,583
Equity Incentive Plan [Member] |  |  |
Share-based compensation |  |  |
Number of common stock reserved for issuance |  | 4,004,964 |
Reserved but unissued shares under the Consultant Plan at January 1 |  | 1,296,462 | 191,656
Increases in the number of authorized shares under the Consultant Plan | 1,231,593 | 1,236,346 | 1,106,088
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | 1,231,593 | 1,236,346 | 1,106,088
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum | 15.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 4,004,214 |  |
Maximum increase in available number of authorized shares as a percentage of new shares issued |  | 15.00% |
Grants of stock options (in shares) |  | (1,328,718) | (224,000)
Stock option forfeitures (in shares) |  | 77,937 | 337,583
Stock grants |  |  | (114,865)
Reserved but unissued shares under the Consultant Plan at Period End |  | 1,282,027 | 1,296,462
Equity Incentive Plan [Member] | Minimum [Member] |  |  |
Share-based compensation |  |  |
Purchase price (as a percent) |  | 85.00% |

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Net number of non-option equity instruments granted to participants. + 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)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of additional shares authorized for issuance under share-based payment arrangement. + References No definition available. + Details
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- Definition Number of shares authorized for issuance 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=116856206&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=116856206&loc=d3e5070-113901 + Details
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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=116856206&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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