Derivative Financial Instruments (Details) (Derivative instrument liability, Warrants, USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Black-Scholes option pricing model
Range of assumptions used to determine the fair value of the warrants
Estimated fair value of Synergy common stock (in dollars per share)	$ 5.55	$ 5.26
Expected volatility (as a percent)	60.00%	60.00%
Dividend yield (as a percent)	0.00%	0.00%
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)	0.26%	0.23%
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)	1.76%	1.33%
Binomial model
Range of assumptions used to determine the fair value of the warrants
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
Estimated fair value of Synergy common stock (in dollars per share)		$ 3.28
Expected warrant term		4 years 1 month 17 days
Risk-free interest rate (as a percent)		0.62%
Binomial model | Maximum
Range of assumptions used to determine the fair value of the warrants
Estimated fair value of Synergy common stock (in dollars per share)		$ 4.53
Expected warrant term		4 years 7 months 17 days
Risk-free interest rate (as a percent)		1.04%