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Share Capital (Details Textual) | Jun. 30, 2018 vote shares | Dec. 31, 2017 shares | Jun. 01, 2016 shares
--- | --- | --- | ---
Preferred Stock | Series 4 Convertible Preferred Stock |  |  |
Share Capital [Line Items] |  |  |
Shares outstanding (shares) | 95,000 | 95,000 |
Common Stock |  |  |
Share Capital [Line Items] |  |  |
Shares outstanding (shares) | 57,454,028 | 56,375,131 |
Common Stock | Common Class A |  |  |
Share Capital [Line Items] |  |  |
Shares outstanding (shares) | 57,450,273 | 56,371,376 |
Common stock, voting rights, number of votes per share | vote | 1 |  |
Common Stock | Common Class B |  |  |
Share Capital [Line Items] |  |  |
Shares outstanding (shares) | 3,755 | 3,755 |
Common stock, voting rights, number of votes per share | vote | 20 |  |
Employee Stock Option [Member] | Stock Incentive Plan 2016 [Member] |  |  |
Share Capital [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  | 2,750,000
Additional Authorized on June 2018 [Member] | Employee Stock Option [Member] | Stock Incentive Plan 2016 [Member] |  |  |
Share Capital [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  | 1,250,000

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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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