Fair Value of Financial Assets and Liabilities - Derivative Instruments (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value of Financial Assets and Liabilities - Derivative Instruments [Abstract]

Financial Liabilities Measured at Fair Value

	Quoted Prices in
	Active Markets		Significant Other		Significant
	for Identical		Observable Inputs		Unobservable
	Items (Level 1)		(Level 2)		Inputs (Level 3)		Total
December 31, 2018
Liabilities
June 2016 offering warrant liability	$	-	$	-	$	1,000	$	1,000
November 2016 offering warrant liability		-		-		21,000		21,000
Total liabilities	$	-	$	-	$	22,000	$	22,000
December 31, 2017
Liabilities
June 2016 offering warrant liability	$	-	$	-	$	32,000	$	32,000
November 2016 offering warrant liability		-		-		260,000		260,000
Total liabilities	$	-	$	-	$	292,000	$	292,000

Changes in Fair Value of Derivative Liability

The following table sets forth a summary of changes in the fair value of the Company's derivative liabilities:

	June 2016		November 2016
	Offering		Offering		Total
	Warrant		Warrant		Derivative
	Liability		Liability		Liabilities
Balance, December 31, 2017	$	32,000	$	260,000	$	292,000
Changes in estimated fair value		(31,000)		(55,000)		(86,000)
Exercised warrants		-		(184,000)		(184,000)
Balance, December 31, 2018	$	1,000	$	21,000	$	22,000