Derivative Financial Instruments (Details) (Derivative instrument liability, Warrants, USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
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)	$ 4.57	$ 4.75
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 9 months 18 days	2 years 9 months 18 days
Risk-free interest rate (as a percent)	0.33%	0.32%
Black-Scholes option pricing model | Maximum
Range of assumptions used to determine the fair value of the warrants
Expected warrant term	4 years 4 months 24 days	5 years 4 months 24 days
Risk-free interest rate (as a percent)	1.39%	1.33%
Binomial model
Range of assumptions used to determine the fair value of the warrants
Expected volatility (as a percent)		60.00%
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
Expected warrant term		4 years 4 months 24 days
Risk-free interest rate (as a percent)		0.72%
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)		$ 4.50
Expected warrant term		4 years 7 months 6 days
Risk-free interest rate (as a percent)		1.03%