Commitments and contingencies - Agreement with Digital Energy Corp. (Details) |
Jul. 09, 2020 |
|---|---|
| Loss Contingencies [Line Items] | |
| Period of severance benefits for key management employees under the plan | 12 months |
| Change in Control Severance Benefit Plan, period in force | 3 years |
| Change in Control Severance Benefit Plan, extension period | 1 year |
| Change in Control Severance Benefit Plan, notice period for cancellation | 6 months |
| Change in Control Severance Benefit Plan, qualifying termination period prior to change in control | 3 months |
| Change in Control Severance Benefit Plan, qualifying termination period after change in control | 18 months |
| X | ||||||||||
- Definition Change in Control Severance Benefit Plan, Notice Period for Cancellation No definition available.
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| X | ||||||||||
- Definition Change in Control Severance Benefit Plan, Period in Force No definition available.
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| X | ||||||||||
- Definition Change in Control Severance Benefit Plan, Period in Force, Extension No definition available.
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| X | ||||||||||
- Definition Change in Control Severance Benefit Plan, Threshold Period for Termination after to Change in Control No definition available.
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| X | ||||||||||
- Definition Change in Control Severance Benefit Plan, Threshold Period for Termination Prior to Change in Control No definition available.
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| X | ||||||||||
- Definition Period of Severance Benefits for Key Management Employees under the Plan No definition available.
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| X | ||||||||||
- 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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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