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Stockholders’ Equity - Narartive 2 (Details) - shares | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2018 | May 31, 2018 | May 31, 2016 | May 31, 2014 | May 31, 2013 | May 31, 2012 | May 31, 2011
Stock Compensation Plans |  |  |  |  |  |  |  |  |
Shares reserved for future issuance related to stock plans |  |  | 7,716,849 |  |  |  |  |  |
Stock Incentive Plan 2010 |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |
Shares authorized for issuance |  |  |  | 36,753,475 | 30,753,475 | 24,753,475 | 21,753,475 | 16,553,475 | 12,553,475
Stock Options |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |
Expiration period | 10 years | 7 years |  |  |  |  |  |  |
Stock Options | Stock Incentive Plan 2010 | Non-employee Director |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |
Expiration period |  |  | 10 years |  |  |  |  |  |

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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