Derivative Financial Instruments (Details) (Derivative instrument liability, Warrants, USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 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)	$ 4.32	$ 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	5 years	5 years
Risk-free interest rate (as a percent)	0.36%	0.32%
Black-Scholes option pricing model | Maximum
Range of assumptions used to determine the fair value of the warrants
Expected warrant term	7 years	7 years
Risk-free interest rate (as a percent)	1.41%	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%