Sharebased payments (Tables)

3 Months Ended

Mar. 31, 2021

Sharebased payments

Summary of Nonemployee common stock warrants -Fully-vested upon issuance

	Number of Warrants			Weighted- average Exercise Price		Weighted- average Remaining Life (Years)		Aggregate Intrinsic Value
Outstanding, December 31, 2020		11,916,503		$	0.05		1.9	$	10,500
Granted		--			--		--		--
Forfeited or expired		(1,266,503	)		0.30		--		--
Outstanding, March 31, 2021		10,650,000			0.02		2.3		472,700
Exercisable, March 31, 2021		10,650,000		$	0.02		2.3	$	472,700