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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Total
Balances at Dec. 31, 2011	$ 131,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	$ 932,066,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	$ (785,503,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	$ (91,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	$ 146,603,000us-gaap_StockholdersEquity
Balances (in shares) at Dec. 31, 2011	131,443,148us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Increase (Decrease) in Stockholders' Equity
Net loss			(68,881,000)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember		(68,881,000)us-gaap_NetIncomeLoss
Other comprehensive income (loss)				131,000us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	131,000us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Stock-based compensation related to issuance of common stock and options in exchange for services		135,000gern_StockAndOptionsIssuedDuringPeriodValueIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember			135,000gern_StockAndOptionsIssuedDuringPeriodValueIssuedForServices
Stock-based compensation related to issuance of common stock and options in exchange for services (in shares)	170,298us-gaap_StockIssuedDuringPeriodSharesIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Cancellations of non-vested restricted stock under equity plans, net of issuances of common stock	(2,000)gern_StockIssuedDuringPeriodValueRestrictedStockAwardForfeituresNetOfIssuancesOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	269,000gern_StockIssuedDuringPeriodValueRestrictedStockAwardForfeituresNetOfIssuancesOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember			267,000gern_StockIssuedDuringPeriodValueRestrictedStockAwardForfeituresNetOfIssuancesOfCommonStock
Cancellations of non-vested restricted stock under equity plans, net of issuances of common stock (in shares)	(2,592,375)gern_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeituresNetOfIssuancesOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Stock-based compensation for equity-based awards to employees and directors		5,311,000us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember			5,311,000us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
401(k) contribution	1,000us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	2,086,000us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember			2,087,000us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan
401(k) contribution (in shares)	1,221,624us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Balances at Dec. 31, 2012	130,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	939,867,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	(854,384,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	40,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	85,653,000us-gaap_StockholdersEquity
Balances (in shares) at Dec. 31, 2012	130,242,695us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Increase (Decrease) in Stockholders' Equity
Net loss			(38,379,000)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember		(38,379,000)us-gaap_NetIncomeLoss
Other comprehensive income (loss)				(54,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	(54,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Stock-based compensation related to issuance of common stock and options in exchange for services		252,000gern_StockAndOptionsIssuedDuringPeriodValueIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember			252,000gern_StockAndOptionsIssuedDuringPeriodValueIssuedForServices
Stock-based compensation related to issuance of common stock and options in exchange for services (in shares)	66,853us-gaap_StockIssuedDuringPeriodSharesIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Cancellations of non-vested restricted stock under equity plans, net of issuances of common stock		6,553,000gern_StockIssuedDuringPeriodValueRestrictedStockAwardForfeituresNetOfIssuancesOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember			6,553,000gern_StockIssuedDuringPeriodValueRestrictedStockAwardForfeituresNetOfIssuancesOfCommonStock
Cancellations of non-vested restricted stock under equity plans, net of issuances of common stock (in shares)	(388,056)gern_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeituresNetOfIssuancesOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Stock-based compensation for equity-based awards to employees and directors		4,435,000us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember			4,435,000us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
401(k) contribution	1,000us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	1,296,000us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember			1,297,000us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan
401(k) contribution (in shares)	756,457us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Balances at Dec. 31, 2013	131,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	952,403,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	(892,763,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	(14,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	59,757,000us-gaap_StockholdersEquity
Balances (in shares) at Dec. 31, 2013	130,677,949us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember				130,677,949us-gaap_CommonStockSharesOutstanding
Increase (Decrease) in Stockholders' Equity
Net loss			(35,670,000)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember		(35,670,000)us-gaap_NetIncomeLoss
Other comprehensive income (loss)				(70,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	(70,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Issuance of common stock in connection with public offering, net of issuance costs of $6,695,000	26,000us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	96,779,000us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember			96,805,000us-gaap_StockIssuedDuringPeriodValueNewIssues
Issuance of common stock in connection with public offering, net of issuance costs (in shares)	25,875,000us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Stock-based compensation related to issuance of common stock and options in exchange for services		253,000gern_StockAndOptionsIssuedDuringPeriodValueIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember			253,000gern_StockAndOptionsIssuedDuringPeriodValueIssuedForServices
Stock-based compensation related to issuance of common stock and options in exchange for services (in shares)	71,239us-gaap_StockIssuedDuringPeriodSharesIssuedForServices / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Issuance of common stock upon net exercise of warrants (in shares)	168,039gern_StockIssuedDuringPeriodSharesNetExerciseOfWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Issuance of common stock under equity plans, net of cancellations of non-vested restricted stock		1,555,000us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember			1,555,000us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
Issuance of common stock under equity plans, net of cancellations of non-vested restricted stock (in shares)	564,950us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Stock-based compensation for equity-based awards to employees and directors		7,658,000us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember			7,658,000us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
401(k) contribution		424,000us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember			424,000us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan
401(k) contribution (in shares)	72,694us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Balances at Dec. 31, 2014	$ 157,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	$ 1,059,072,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	$ (928,433,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	$ (84,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	$ 130,712,000us-gaap_StockholdersEquity
Balances (in shares) at Dec. 31, 2014	157,429,871us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember				157,429,871us-gaap_CommonStockSharesOutstanding

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Value of stock and options issued in lieu of cash for services contributed to the entity. Value includes, but is not limited to, services contributed by vendors and founders.

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