Derivative Financial Instruments (Details) (Derivative instrument liability, Warrants, USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Black-Scholes option pricing model
Range of assumptions used to determine the fair value of the warrants
Fair value of Synergy common stock (in dollars per share)	$ 5.31	$ 6.07
Expected volatility (as a percent)	60.00%	60.00%
Black-Scholes option pricing model | Minimum
Range of assumptions used to determine the fair value of the warrants
Expected warrant term	1 year 3 months	2 years 3 months
Risk-free interest rate (as a percent)	0.13%	0.31%
Black-Scholes option pricing model | Maximum
Range of assumptions used to determine the fair value of the warrants
Expected warrant term	3 years 10 months 24 days	4 years 10 months 24 days
Risk-free interest rate (as a percent)	1.32%	0.77%
Binomial model
Range of assumptions used to determine the fair value of the warrants
Expected warrant term		3 years 7 months 17 days
Risk-free interest rate (as a percent)		0.36%
Expected volatility (as a percent)		60.00%
Dividend yield (as a percent)		0.00%
Binomial model | Minimum
Range of assumptions used to determine the fair value of the warrants
Fair value of Synergy common stock (in dollars per share)		$ 3.28
Binomial model | Maximum
Range of assumptions used to determine the fair value of the warrants
Fair value of Synergy common stock (in dollars per share)		$ 6.07