Notes payable (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Debt Instrument [Line Items]
Notes payable	$ 1,351,021		$ 1,365,132
Less current maturities	(1,314,021)		(629,017)
Notes payable, excluding current maturities	37,000		736,115
Senior Secured Promissory Notes
Debt Instrument [Line Items]
Notes payable	0	$ 334,000	23,000
Robofusion note payable
Debt Instrument [Line Items]
Notes payable	1,092,021		1,342,132
Promissory Note
Debt Instrument [Line Items]
Notes payable	$ 259,000		$ 0

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No definition available.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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