XML 61 R40.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Long-term Debt (Detail) |  |  |  |  |  |  |  |  |  | 2 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 10, 2017 | May 01, 2017 $ / shares shares | Apr. 01, 2017 USD ($) $ / shares | Dec. 14, 2016 USD ($) Price Days $ / shares | Aug. 22, 2016 USD ($) $ / shares | Jul. 13, 2016 $ / shares shares | May 10, 2016 USD ($) $ / shares shares | Jan. 12, 2016 USD ($) $ / shares shares | May 08, 2013 USD ($) $ / shares shares | Feb. 28, 2017 USD ($) shares | Jun. 30, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) shares | Aug. 07, 2017 | Mar. 15, 2017 USD ($) | Jul. 29, 2016 $ / shares | Jun. 29, 2016 $ / shares shares
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan, amount |  |  |  |  |  |  |  |  | $ 10,000,000 |  | $ 19,100,000 |  |  |  |  |  |  |
Term for interest only payments |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |  |  |  |  |
Fixed coupon rate |  |  |  |  |  |  |  |  | 8.45% |  |  |  |  |  |  |  |  |
Term for principal and interest payments |  |  |  |  |  |  |  |  | 30 months |  |  |  |  |  |  |  |  |
Cash facility fee percentage |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |
Cash final payment percentage |  |  |  |  |  |  |  |  | 5.50% |  |  |  |  |  |  |  |  |
Warrant term |  |  |  |  |  |  |  |  | 7 years |  |  | 5 years |  |  |  |  |  |
Number of shares availabe from warrants | shares |  |  |  |  |  |  |  |  | 9,109 |  |  |  |  |  |  |  |  |
Exercise price | $ / shares |  |  |  |  |  | $ 13.00 | $ 30.20 | $ 28.40 | $ 49.4 |  | $ 79.40 | $ 79.40 | $ 79.40 |  |  |  | $ 8.60 |
Debt instrument, covenant, compensating cash balance |  |  |  |  |  |  |  |  |  |  | $ 13,200,000 |  |  |  |  |  |  |
Warrants outstanding, shares | shares |  |  |  |  |  |  |  |  |  |  | 19,557,000 | 2,570,000 | 1,116,000 | 428,000 |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |  |  | $ 17,621,702 |  |  |  | $ 13,671,702 |  |
Senior notes, current |  |  |  |  |  |  |  |  |  |  |  | 16,397,030 |  |  |  |  |  |
Unamortized discount and debt issuance costs |  |  |  |  |  |  |  |  |  |  | $ 146,552 | 1,224,672 |  |  |  |  |  |
Issuance of common stock, value |  |  |  |  |  |  |  | $ 21,800,000 |  | $ 3,950,000 |  | $ 33,534,000 | $ 47,416,000 | $ 10,705,000 |  |  |  |
Issuance of common stock, shares | shares |  |  |  |  |  |  |  | 988,636 |  | 3,541,077 |  |  |  |  |  |  |  |
Placement agent fee percentage |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |
Duration of average market price used for warrant exercise price |  |  |  |  |  |  |  |  | 20 days |  |  |  |  |  |  |  |  |
Common stock, shares outstanding | shares |  | 37,435,524 |  |  |  |  |  |  |  |  | 37,435,524 | 15,190,473 | 8,095,337 |  |  |  |  |
Common stock, shares issued | shares |  |  |  |  |  |  |  |  |  |  | 37,469,274 | 15,224,223 | 8,129,087 |  |  |  |  |
Outstanding principle |  |  |  |  |  |  |  |  |  |  | $ 13,171,702 | $ 17,621,702 |  |  |  |  |  |
Current portion of long-term debt |  |  |  |  |  |  |  |  |  |  | 13,025,180 | 16,397,030 | $ 4,739,000 |  |  |  |  |
Principle redeemed |  |  |  |  |  |  |  |  |  |  | $ 4,450,000 |  |  |  |  |  |  |
Shares issued for debt, shares | shares |  |  |  |  |  |  |  |  |  |  | 4,497,466 |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, value |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 3,000 | $ 1,000 |  |  |  |
Issuance of common stock, shares | shares |  |  |  |  |  | 1,400,000 |  |  |  |  |  | 2,872,803 | 1,607,934 | 331,650 |  |  |  |
Secured Debt | Securities Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term for interest only payments |  |  |  | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares availabe from warrants | shares |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |
Exercise price | $ / shares |  |  |  |  |  |  | $ 0.0001 |  |  |  |  |  |  |  |  |  |  |
Original issue discount, percent |  |  |  |  |  |  | 6.375% |  |  |  |  |  |  |  |  |  |  |
Principle amount of debt |  |  |  |  |  |  | $ 25,530,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt and warrants |  |  |  |  |  |  | 23,400,000 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, covenant, compensating cash balance |  |  |  |  |  |  | 24,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt principal that could be redeemed |  |  |  | $ 1,500,000 |  |  | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |
Common stock trading price threshold for debt redemption | $ / shares |  |  |  | $ 8.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt principal that could be redeemed based on common stock price |  |  |  | $ 2,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of elections company can make in 12 month period |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |
Debt principal that could be redeemed based on company's elections |  |  |  | $ 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Delivery discount percentage |  |  |  | 7.50% |  |  | 7.50% |  |  |  |  |  |  |  |  |  |  |
Number of lowest volume weighted average prices during prior trading days used to compute average | Price |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days | Days |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount to the prior trading day's volume weighted average price |  |  |  | 7.50% |  |  | 7.50% |  |  |  |  |  |  |  |  |  |  |
Duration of average market price used for warrant exercise price |  |  |  |  |  |  | 3 days |  |  |  |  |  |  |  |  |  |  |
Minimum price condition (per share) | $ / shares |  |  |  |  |  |  | $ 15.00 |  |  |  |  |  |  |  |  |  |  |
Percentage of VWAPs |  |  |  |  |  |  | 92.50% |  |  |  |  |  |  |  |  |  |  |
Secured Debt | Amendment Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed coupon rate |  |  |  |  | 9.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, covenant, compensating cash balance |  |  |  |  | $ 18,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt principal that could be redeemed |  |  |  |  | $ 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock trading price threshold for debt redemption | $ / shares |  |  |  |  | $ 8.00 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt principal that could be redeemed based on common stock price |  |  |  |  | $ 2,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt principal that could be redeemed based on company's elections |  |  |  |  | $ 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Price per share that holder can convert outstanding debt balance | $ / shares |  |  |  |  | $ 12.00 |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum price condition (per share) | $ / shares |  |  |  |  | $ 4.00 |  |  |  |  |  |  |  |  |  |  |  |  |
Final payment of interest |  |  |  |  | $ 765,900 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum prepayment of principle if demanded |  |  |  |  | $ 18,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Premium on outstanding prepayment amount |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt | 2017 Amendment Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum price condition (per share) | $ / shares |  | $ 0.35 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued | shares |  | 9,131,868 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of convertible shares | shares |  | 45,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption limit on any given day, percentage of daily dollar trading volume |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |
Secured Debt | Subsequent Event | July 2017 Amendment Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Delivery discount percentage | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of VWAPs | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of days average for exercise price | 20 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of prior day VMAP | 115.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt | Scenario, Previously Reported [Member] | Securities Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares availabe from warrants | shares |  |  |  |  |  |  | 50,000 |  |  |  |  |  |  |  |  |  |  |
Secured Debt | Series A Warrant | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8.60
Warrants outstanding, shares | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000
Secured Debt | Series A Warrant | Common Stock | First Waiver |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption payments |  |  |  | $ 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, covenant, compensating cash balance |  |  |  | $ 18,500,000 | $ 18,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum price condition (per share) | $ / shares |  |  | $ 0.30 | $ 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash in excess of debenture |  |  | $ 10,000,000 | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Daily closing share price appreciation |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt | Series A Warrant | Common Stock | Securities Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant term |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price | $ / shares |  |  |  | $ 30.20 |  |  | $ 30.20 |  |  |  |  |  |  |  |  |  |  |
Secured Debt | Series A Warrant | Common Stock | Amendment Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price | $ / shares |  |  |  |  | $ 8.60 |  | $ 8.60 |  |  |  |  |  |  |  |  |  |  |
Warrants outstanding, shares | shares |  |  |  |  |  |  | 50,000 |  |  |  |  |  |  |  |  |  |  |

X
- Definition Class of Warrant or Right, Term + References No definition available. + Details
Name: | gale_ClassOfWarrantOrRightTerm
Namespace Prefix: | gale_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Class of warrant or right, number of days averaged for exercise price. + References No definition available. + Details
Name: | gale_ClassofWarrantorRightNumberofDaysAveragedforExercisePrice
Namespace Prefix: | gale_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Common stock trading price threshold, for redeeming principal of debt instrument. + References No definition available. + Details
Name: | gale_CommonStockTradingPriceThresholdforRedeemingPrincipalofDebtInstrument
Namespace Prefix: | gale_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt instrument cash facility fee. + References No definition available. + Details
Name: | gale_DebtInstrumentCashFacilityFee
Namespace Prefix: | gale_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt instrument cash final payment. + References No definition available. + Details
Name: | gale_DebtInstrumentCashFinalPayment
Namespace Prefix: | gale_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Instrument Cash In Excess Of Debenture + References No definition available. + Details
Name: | gale_DebtInstrumentCashInExcessOfDebenture
Namespace Prefix: | gale_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Debt Instrument, Closing Share Price In Excess Of Preceding Day + References No definition available. + Details
Name: | gale_DebtInstrumentClosingSharePriceInExcessOfPrecedingDay
Namespace Prefix: | gale_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt instrument, common stock minimum price condition. + References No definition available. + Details
Name: | gale_DebtInstrumentCommonStockMinimumPriceCondition
Namespace Prefix: | gale_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, Convertible, Number of Shares + References No definition available. + Details
Name: | gale_DebtInstrumentConvertibleNumberOfShares
Namespace Prefix: | gale_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt instrument, covenant, liquidity covenant. + References No definition available. + Details
Name: | gale_DebtInstrumentCovenantLiquidityCovenant
Namespace Prefix: | gale_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Debt instrument, delivery discount percentage. + References No definition available. + Details
Name: | gale_DebtInstrumentDeliveryDiscountPercentage
Namespace Prefix: | gale_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, Maximum Prepayment Of Principle Upon Demand + References No definition available. + Details
Name: | gale_DebtInstrumentMaximumPrepaymentOfPrincipleUponDemand
Namespace Prefix: | gale_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Debt instrument original issue discount percent. + References No definition available. + Details
Name: | gale_DebtInstrumentOriginalIssueDiscountPercent
Namespace Prefix: | gale_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Instrument, Percentage of Prior Day Volume Weighted Average Price + References No definition available. + Details
Name: | gale_DebtInstrumentPercentageofPriorDayVolumeWeightedAveragePrice
Namespace Prefix: | gale_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, Percentage of Volume Weighted Average Price + References No definition available. + Details
Name: | gale_DebtInstrumentPercentageofVolumeWeightedAveragePrice
Namespace Prefix: | gale_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt instrument placement agent fee percent of funds received. + References No definition available. + Details
Name: | gale_DebtInstrumentPlacementAgentFeePercentofFundsReceived
Namespace Prefix: | gale_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, Premium On Outstanding Prepayment Amount + References No definition available. + Details
Name: | gale_DebtInstrumentPremiumOnOutstandingPrepaymentAmount
Namespace Prefix: | gale_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt instrument, principal that could be redeemed. + References No definition available. + Details
Name: | gale_DebtInstrumentPrincipalThatCouldBeRedeemed
Namespace Prefix: | gale_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Debt instrument, principal that could be redeemed, company's election. + References No definition available. + Details
Name: | gale_DebtInstrumentPrincipalThatCouldBeRedeemedCompanysElection
Namespace Prefix: | gale_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Debt instrument, principal that could be redeemed, company's monthly stock price threshold. + References No definition available. + Details
Name: | gale_DebtInstrumentPrincipalThatCouldBeRedeemedCompanysMonthlyStockPriceThreshold
Namespace Prefix: | gale_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Debt instrument prior trading days volume weighted average price discount rate. + References No definition available. + Details
Name: | gale_DebtInstrumentPriorTradingDaysVolumeWeightedAveragePriceDiscountRate
Namespace Prefix: | gale_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, Redemption, Limit Amount on a Given Trading Day + References No definition available. + Details
Name: | gale_DebtInstrumentRedemptionLimitAmountonaGivenTradingDay
Namespace Prefix: | gale_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt instrument redemption number of days maximum. + References No definition available. + Details
Name: | gale_DebtInstrumentRedemptionNumberofDaysMaximum
Namespace Prefix: | gale_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt instrument redemption numberof lowest weighted average pricesto apply discount rate. + References No definition available. + Details
Name: | gale_DebtInstrumentRedemptionNumberofLowestWeightedAveragePricestoApplyDiscountRate
Namespace Prefix: | gale_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Instrument Redemption Principal Amount Redeemed + References No definition available. + Details
Name: | gale_DebtInstrumentRedemptionPrincipalAmountRedeemed
Namespace Prefix: | gale_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Debt Instrument, Redemption, Redemption Payments + References No definition available. + Details
Name: | gale_DebtInstrumentRedemptionRedemptionPayments
Namespace Prefix: | gale_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Debt instrument term interest only. + References No definition available. + Details
Name: | gale_DebtInstrumentTermInterestOnly
Namespace Prefix: | gale_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Exercise price is based on the average closing price over this many trading days up to the date of the grant. + References No definition available. + Details
Name: | gale_NumberofDaysAveragedforExercisePrice
Namespace Prefix: | gale_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Numberof Elections Company Can Makein Yearto Redeem Debt Instrument Principal + References No definition available. + Details
Name: | gale_NumberofElectionsCompanyCanMakeinYeartoRedeemDebtInstrumentPrincipal
Namespace Prefix: | gale_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Proceeds from issuance of long-term debt and warrants, net. + References No definition available. + Details
Name: | gale_ProceedsfromIssuanceofLongtermDebtandWarrantsNet
Namespace Prefix: | gale_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockSharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
Name: | us-gaap_CommonStockSharesOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 + Details
Name: | us-gaap_ConversionOfStockSharesConverted1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
Name: | us-gaap_DebtInstrumentConvertibleConversionPrice1
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13476-108611 + Details
Name: | us-gaap_DebtInstrumentFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of the required periodic payments applied to interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentPeriodicPaymentInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of unamortized debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
Name: | us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebtCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_SeniorNotes
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying value as of the balance sheet date of the portion of long-term notes having the highest claim on the assets of the issuer in case of bankruptcy or liquidation, due within one year or the normal operating cycle, if longer. Senior note holders are paid off in full before any payments are made to debt holders having a lesser priority of repayment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_SeniorNotesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of new stock issued during the period. + References Reference 1: 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. + References Reference 1: 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_StockIssuedDuringPeriodValueNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gale_SecuritiesPurchaseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gale_AmendmentAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gale_TwoThousandAndSeventeenAmendmentAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gale_July2017AmendmentAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioPreviouslyReportedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=gale_SeriesAWarrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gale_FirstWaiverMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |