Summary of significant accounting policies - Property, Plant and Equipment (Details) |
12 Months Ended |
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Dec. 31, 2018
USD ($)
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| Property, Plant and Equipment [Line Items] | |
| Utility rebates applied to cost of construction | $ 180,000 |
| Minimum | |
| Property, Plant and Equipment [Line Items] | |
| Property, plant and equipment, estimated useful lives | 3 years |
| Maximum | |
| Property, Plant and Equipment [Line Items] | |
| Property, plant and equipment, estimated useful lives | 15 years |
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- Definition Utility Rebates Applied to Cost of Construction No definition available.
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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. No definition available.
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. No definition available.
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