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

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Derivative Financial Instruments - Range of Assumptions (Details) - $ / shares		12 Months Ended
	Nov. 13, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Minimum
Range of assumptions used to determine the fair value of the warrants
Expected warrant term		2 months 12 days
Maximum
Range of assumptions used to determine the fair value of the warrants
Expected warrant term		1 year 10 months 24 days
Derivative instrument liability \| Warrants \| Black Scholes option pricing model or Monte Carlo simulation
Range of assumptions used to determine the fair value of the warrants
Fair value of Synergy common stock (in dollars per share)	$ 2.44	$ 2.23	$ 6.09	$ 5.67
Expected warrant term	2 years		1 year 2 months 12 days	2 years 2 months 12 days
Risk-free interest rate	1.62%		1.03%	1.18%
Expected volatility	66.00%		50.00%
Dividend yield	0.00%	0.00%	0.00%	0.00%
Derivative instrument liability \| Warrants \| Black Scholes option pricing model or Monte Carlo simulation \| Minimum
Range of assumptions used to determine the fair value of the warrants
Risk-free interest rate		1.34%
Expected volatility		50000.00%		50.00%
Derivative instrument liability \| Warrants \| Black Scholes option pricing model or Monte Carlo simulation \| Maximum
Range of assumptions used to determine the fair value of the warrants
Risk-free interest rate		1.78%
Expected volatility		67000.00%		80.00%