Equipment loan payables (Details) - USD ($)	3 Months Ended		9 Months Ended		36 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2018
Equipment Loan Payable [Line Items]
Frequency of payment					monthly
Future payments as per agreement
2020 (represents three remaining months)	$ 55,000		$ 55,000
2021	333,000		333,000
Total	500,000		500,000
Equipment Loan Payable [Member]
Equipment Loan Payable [Line Items]
Interest expense	10,000	$ 11,000	20,000	$ 38,000
Future payments as per agreement
2020 (represents three remaining months)	51,000		51,000
2021	117,000		117,000
Total	168,000		168,000
Less amounts representing interest			(8,000)
Total equipment loan payable	$ 160,000		$ 160,000
Equipment Loan Payable [Member] | Minimum
Equipment Loan Payable [Line Items]
Term of agreement					36 months
Monthly payments					$ 1,000
Interest rate					9.03%
Equipment Loan Payable [Member] | Maximum
Equipment Loan Payable [Line Items]
Term of agreement					38 months
Monthly payments					$ 8,000
Interest rate					12.08%