Derivative Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2016

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of range of assumptions used to determine the fair value of the warrants

The range of assumptions used to determine the fair value of the warrants at each period end was:

	Year Ended December 31, 2016			Year Ended December 31, 2015			Year Ended December 31, 2014
Fair value of Synergy common stock	$	6.09		$	5.67		$	3.05
Expected warrant term	1.2 years			2.2 years			0.49-3.9 years
Risk-free interest rate	1.03		%	1.18		%	0.08%-1.32%
Expected volatility	50		%	50%-80%			52%-60%
Dividend yield	—			—			—

Schedule of changes in derivative financial instruments and associated liability balance

The following table sets forth the components of changes in the Synergy’s outstanding warrants which were deemed derivative financial instruments and the associated liability balance for the periods indicated:

Date	Description	Warrants		Derivative Instrument Liability (in thousands)
12/31/2014	Balance of derivative financial instruments liability	858,469		$	172
3/31/2015	Change in fair value of warrants during the quarter	—		268
6/30/2015	Change in fair value of warrants during the quarter	—		1,541
6/30/2015	Expiration of warrants	(324,000	)	—
9/30/2015	Change in fair value of warrants during the quarter	—		(1,445		)
9/30/2015	Exercise of warrants	(30,000	)	—
9/30/2015	Expiration of warrants	(2,469	)	(3		)
12/31/2015	Change in fair value of warrants during the quarter	—		30
12/31/2015	Exercise of warrants	—		—
12/31/2015	Expiration of warrants	(292,000	)	(241		)
12/31/2015	Balance of derivative financial instruments liability	210,000		322
3/31/2016	Change in fair value of warrants during the 3 months ended March 31, 2016	—		(260		)
6/30/2016	Change in fair value of warrants during the 3 months ended June 30, 2016	—		22
9/30/2016	Change in fair value of warrants during the 3 months ended September 30, 2016	—		87
12/31/2016	Change in fair value of warrants during the 3 months ended December 31, 2016	—		45
12/31/2016	Balance of derivative financial instruments liability	210,000		$	216