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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash flows from operating activities: |  |  |
Net loss | $ (35,670)us-gaap_NetIncomeLoss | $ (38,379)us-gaap_NetIncomeLoss | $ (68,881)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |  |
Depreciation and amortization | 47us-gaap_DepreciationNonproduction | 320us-gaap_DepreciationNonproduction | 830us-gaap_DepreciationNonproduction
Accretion and amortization on investments, net | 2,889us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments | 1,322us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments | 2,184us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments
Loss (gain) on retirement/sales of property and equipment, net | 3us-gaap_GainLossOnSaleOfPropertyPlantEquipment | (831)us-gaap_GainLossOnSaleOfPropertyPlantEquipment | (142)us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Loss on write-downs of property and equipment |  | 200us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 271us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Stock-based compensation for services by non-employees | 253us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims | 252us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims | 183us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims
Stock-based compensation for employees and directors | 7,658us-gaap_ShareBasedCompensation | 4,435us-gaap_ShareBasedCompensation | 5,311us-gaap_ShareBasedCompensation
Amortization related to 401(k) contributions | 111gern_AmortizationRelatedToShareBasedMatchingContributions | 458gern_AmortizationRelatedToShareBasedMatchingContributions | 726gern_AmortizationRelatedToShareBasedMatchingContributions
Unrealized (gain) loss on derivatives | (351)us-gaap_UnrealizedGainLossOnDerivatives | 316us-gaap_UnrealizedGainLossOnDerivatives | (13)us-gaap_UnrealizedGainLossOnDerivatives
Changes in assets and liabilities: |  |  |
Interest and other receivables | (399)gern_IncreaseDecreaseInAccruedInterestReceivableNetAndOtherReceivables | 188gern_IncreaseDecreaseInAccruedInterestReceivableNetAndOtherReceivables | 646gern_IncreaseDecreaseInAccruedInterestReceivableNetAndOtherReceivables
Prepaid assets | (72)us-gaap_IncreaseDecreaseInPrepaidExpense | 1,081us-gaap_IncreaseDecreaseInPrepaidExpense | 1,311us-gaap_IncreaseDecreaseInPrepaidExpense
Deposits and other assets | 5us-gaap_IncreaseDecreaseInDepositsOutstanding | (4)us-gaap_IncreaseDecreaseInDepositsOutstanding | 112us-gaap_IncreaseDecreaseInDepositsOutstanding
Accounts payable | (364)us-gaap_IncreaseDecreaseInAccountsPayable | (2,032)us-gaap_IncreaseDecreaseInAccountsPayable | 449us-gaap_IncreaseDecreaseInAccountsPayable
Accrued compensation and benefits | 580us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities | (431)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities | 3,548us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Accrued restructuring charges | (94)us-gaap_IncreaseDecreaseInRestructuringReserve | (1,878)us-gaap_IncreaseDecreaseInRestructuringReserve | (1,758)us-gaap_IncreaseDecreaseInRestructuringReserve
Accrued liabilities | (246)us-gaap_IncreaseDecreaseInOtherAccruedLiabilities | (1,697)us-gaap_IncreaseDecreaseInOtherAccruedLiabilities | (92)us-gaap_IncreaseDecreaseInOtherAccruedLiabilities
Deferred revenue | 35,000us-gaap_IncreaseDecreaseInDeferredRevenue |  |
Translation adjustment |  |  | 169us-gaap_CumulativeTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease
Net cash provided by (used in) operating activities | 9,350us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | (36,680)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | (55,146)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities: |  |  |
Restricted cash transfer | 529us-gaap_IncreaseDecreaseInRestrictedCash | (1)us-gaap_IncreaseDecreaseInRestrictedCash | (1)us-gaap_IncreaseDecreaseInRestrictedCash
Purchases of property and equipment | (131)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (3)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (862)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sales of property and equipment |  | 1,196us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 170us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Purchases of marketable securities | (190,263)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (88,977)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (79,369)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Proceeds from sales/calls of marketable securities | 10,549us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt |  |
Proceeds from maturities of marketable securities | 101,412us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities | 108,839us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities | 141,016us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Net cash (used in) provided by investing activities | (77,904)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | 21,054us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | 60,954us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities: |  |  |
Proceeds from issuance of common stock, net of issuance costs | 98,360us-gaap_ProceedsFromIssuanceOfCommonStock | 6,553us-gaap_ProceedsFromIssuanceOfCommonStock | 150us-gaap_ProceedsFromIssuanceOfCommonStock
Net cash provided by financing activities | 98,360us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | 6,553us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | 150us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase (decrease) in cash and cash equivalents | 29,806us-gaap_NetCashProvidedByUsedInContinuingOperations | (9,073)us-gaap_NetCashProvidedByUsedInContinuingOperations | 5,958us-gaap_NetCashProvidedByUsedInContinuingOperations
Cash and cash equivalents, at beginning of year | 12,990us-gaap_CashAndCashEquivalentsAtCarryingValue | 22,063us-gaap_CashAndCashEquivalentsAtCarryingValue | 16,105us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, at end of year | $ 42,796us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 12,990us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 22,063us-gaap_CashAndCashEquivalentsAtCarryingValue

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28367520&loc=d3e92212-112881 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Impairment -URI http://asc.fasb.org/extlink&oid=6515133 + Details
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- Definition Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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- Definition The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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