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Stockholders' Equity - Stock compensation plans (Details) - shares | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2020 | Apr. 30, 2019 | May 31, 2018
Stock Compensation Plans |  |  |  |  |
Shares reserved for future issuance related to stock plans |  |  | 6,460,660 |  |
2010 Stock Plan |  |  |  |  |
Stock Compensation Plans |  |  |  |  |
Shares reserved for future issuance related to stock plans |  |  |  | 44,453,475 | 36,753,475
Stock Options |  |  |  |  |
Stock Compensation Plans |  |  |  |  |
Expiration period | 10 years | 7 years |  |  |
Stock Options | 2010 Stock Plan | 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://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=120391452&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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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