2.4.0.8125 - Disclosure - Stock-Based Compensation (Details)truefalsefalse1false USDfalsefalse$P04_01_2013To06_30_2013http://www.sec.gov/CIK0000894158duration2013-04-01T00:00:002013-06-30T00:00:00pureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USD_per_ShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2false falsefalseP04_01_2012To06_30_2012http://www.sec.gov/CIK0000894158duration2012-04-01T00:00:002012-06-30T00:00:00pureStandardhttp://www.xbrl.org/2003/instancepurexbrli03false USDfalsefalse$P01_01_2013To06_30_2013http://www.sec.gov/CIK0000894158duration2013-01-01T00:00:002013-06-30T00:00:00pureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USD_per_ShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$4false falsefalseP01_01_2012To06_30_2012http://www.sec.gov/CIK0000894158duration2012-01-01T00:00:002012-06-30T00:00:00pureStandardhttp://www.xbrl.org/2003/instancepurexbrli01false 4syn_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePriceOnesyn_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse00USD$falsetruefalse2falsefalsefalse00falsefalsefalse3truefalsefalse1.741.74USD$falsetruefalse4falsefalsefalse00falsefalsefalsenum:perShareItemTypedecimalAgreed-upon price for the exchange of the underlying asset relating to the share-based payment award.No definition available.false3Exercise price2false 4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRateus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truetruefalse00falsefalsefalse2truetruefalse00falsefalsefalse3truetruefalse00falsefalsefalse4truetruefalse00falsefalsefalsenum:percentItemTypepureThe estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false0Expected dividends3false 4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truetruefalse00falsefalsefalse2truetruefalse1.711.71falsefalsefalse3truetruefalse1.481.48falsefalsefalse4falsefalsefalse00falsefalsefalsenum:percentItemTypepureThe estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. 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