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Employee Benefit Plans (Details) | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) retirement_plan | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Compensation and Retirement Disclosure [Abstract] |  |  |
Number of voluntary defined contribution plans | retirement_plan | 2 |  |
Contributions to the 401(k) plans | $ | $ 0 | $ 0 | $ 0

X
- Definition Number of Voluntary Defined Contribution Plans + References No definition available. + Details
Name: | upld_NumberofVoluntaryDefinedContributionPlans
Namespace Prefix: | upld_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration