XML 64 R50.htm IDEA: XBRL DOCUMENT
v3.6.0.2

STOCKHOLDERS' EQUITY - STOCK OPTIONS OUTSTANDING (Details) | 12 Months Ended
--- | ---
Dec. 31, 2016 $ / shares shares
$1.10 - $1.51 |
Exercise Price Range |
Exercise price, low end of range (in dollars per share) | $ 1.10
Exercise price, high end of range (in dollars per share) | $ 1.51
Options Outstanding |
Number of Shares | shares | 5,668,162
Weighted Average Exercise Price Per Share (in dollars per share) | $ 1.45
Weighted Average Remaining Contractual Life (In years) | 5 years 10 months 21 days
$1.55 - $2.54 |
Exercise Price Range |
Exercise price, low end of range (in dollars per share) | $ 1.55
Exercise price, high end of range (in dollars per share) | $ 2.54
Options Outstanding |
Number of Shares | shares | 5,017,031
Weighted Average Exercise Price Per Share (in dollars per share) | $ 2.27
Weighted Average Remaining Contractual Life (In years) | 7 years 3 months
$2.74 - $5.01 |
Exercise Price Range |
Exercise price, low end of range (in dollars per share) | $ 2.74
Exercise price, high end of range (in dollars per share) | $ 5.01
Options Outstanding |
Number of Shares | shares | 6,347,008
Weighted Average Exercise Price Per Share (in dollars per share) | $ 4.55
Weighted Average Remaining Contractual Life (In years) | 7 years 3 months 11 days
$5.09 - $9.32 |
Exercise Price Range |
Exercise price, low end of range (in dollars per share) | $ 5.09
Exercise price, high end of range (in dollars per share) | $ 9.32
Options Outstanding |
Number of Shares | shares | 2,093,086
Weighted Average Exercise Price Per Share (in dollars per share) | $ 5.59
Weighted Average Remaining Contractual Life (In years) | 5 years 4 months 10 days
$1.10 - $9.32 |
Exercise Price Range |
Exercise price, low end of range (in dollars per share) | $ 1.10
Exercise price, high end of range (in dollars per share) | $ 9.32
Options Outstanding |
Number of Shares | shares | 19,125,287
Weighted Average Exercise Price Per Share (in dollars per share) | $ 3.15
Weighted Average Remaining Contractual Life (In years) | 6 years 7 months 24 days

X
- References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeEndOfPeriodAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=gern_ExercisePriceRangeFromDollars1.10To1.51Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=gern_ExercisePriceRangeFromDollars1.55To2.54Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=gern_ExercisePriceRangeFromDollars2.74To5.01Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=gern_ExercisePriceRangeFromDollars5.09To9.32Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=gern_ExercisePriceRangeFromDollars1.10To9.32Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |