Property and equipment (Narrative) (Details) - USD ($) |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2017 |
Sep. 30, 2016 |
Sep. 30, 2017 |
Sep. 30, 2016 |
Feb. 25, 2016 |
|
| Property, Plant and Equipment [Abstract] | |||||
| Sales price of corporate headquarters, land and building to a third party | $ 4,053,000 | ||||
| Gain on sale of property and equipment | $ 13,062 | $ 1,933,335 | |||
| Proceeds from sale of property and equipment | 1,799,143 | ||||
| Depreciation expense | $ 500 | $ 800 | 1,400 | 2,700 | |
| Depreciation and amortization expense relating to short-term assets included with prepaid expenses | $ 1,500 | $ 12,000 | |||
| X | ||||||||||
- Definition Sales price of corporate headquarters, land and building to a third party. No definition available.
|
| X | ||||||||||
- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of expense charged against earnings to allocate the cost of tangible and intangible assets over their remaining economic lives, classified as other. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|