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Debt Obligations - Summary of Secured Convertible Debentures and Proceeds Investment Agreement (Details) - USD ($) | Sep. 30, 2019 | Dec. 31, 2018
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Debt Disclosure [Abstract] |  |
2018 Proceeds investment agreement, at fair value | $ 6,417,000 | $ 9,142,000
Less: Current portion |  |
2018 Proceeds investment agreement at fair value-less current portion | $ 6,417,000 | $ 9,142,000

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- Definition Proceeds investment agreement, at fair value. + References No definition available. + Details
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Namespace Prefix: | DGLY_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Proceeds investment agreement, at fair value-current. + References No definition available. + Details
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Namespace Prefix: | DGLY_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Proceeds investment agreement, at fair value- less current portion. + References No definition available. + Details
Name: | DGLY_ProceedsInvestmentAgreementAtFairValueNonCurrent
Namespace Prefix: | DGLY_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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