Derivative Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2015

Derivative Financial Instruments

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

	Year Ended	Year Ended	Year Ended
	December 31, 2015	December 31, 2014	December 31, 2013
Fair value of Synergy common stock	$ 5.67	$ 3.05	$ 5.55
Expected warrant term	2.2 years	0.49-3.9 years	1.8-4.4 years
Risk-free interest rate	1.18%	0.08%-1.32%	0.26%-1.76%
Expected volatility	50%-80%	52%-60%	60%
Dividend yield	—	—	—

Schedule of changes in derivative financial instruments and associated liability balance

				Derivative
				Instrument
				Liability
Date	Description	Warrants		(in thousands)
12/31/2013	Balance of derivative financial instruments liability	858,469		1,534
3/31/2014	Fair value of new warrants issued during the quarter	—		—
3/31/2014	Change in fair value of warrants during the quarter	—		(223		)
6/30/2014	Fair value of new warrants issued during the quarter	—		—
6/30/2014	Change in fair value of warrants during the quarter	—		(756		)
9/30/2014	Fair value of new warrants issued during the quarter	—		—
9/30/2014	Change in fair value of warrants during the quarter	—		(425		)
12/31/2014	Fair value of new warrants issued during the quarter	—		—
12/31/2014	Change in fair value of warrants during the quarter	—		42
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		)
9/30/2015	Balance of derivative financial instruments liability	502,000		533
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