Derivative Financial Instruments - Range of Assumptions (Details) - Derivative instrument liability - Warrants - Black-Scholes option pricing model - $ / shares	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Range of assumptions used to determine the fair value of the warrants
Fair value of Synergy common stock (in dollars per share)	$ 6.09	$ 5.67	$ 3.05
Expected warrant term	1 year 2 months 12 days	2 years 2 months 12 days
Risk-free interest rate	1.03%	1.18%
Expected volatility	50.00%
Dividend yield	0.00%	0.00%	0.00%
Minimum
Range of assumptions used to determine the fair value of the warrants
Expected warrant term			5 months 27 days
Risk-free interest rate			0.08%
Expected volatility		50.00%	52.00%
Maximum
Range of assumptions used to determine the fair value of the warrants
Expected warrant term			3 years 10 months 24 days
Risk-free interest rate			1.32%
Expected volatility		80.00%	60.00%

Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

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Risk-free interest rate assumption used in valuing an instrument.

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Price of a single share of a number of saleable stocks of a company.

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