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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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