Long term Purchase Commitment Option to Renew Period Term

No definition available.

Name:	upld_LongtermPurchaseCommitmentOptiontoRenewPeriodTerm
Namespace Prefix:	upld_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Ownership Percentage Minimum

+ References

No definition available.

+ Details

Name:	upld_OwnershipPercentageMinimum
Namespace Prefix:	upld_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage Of Ownership

+ References

No definition available.

+ Details

Name:	upld_PercentageOfOwnership
Namespace Prefix:	upld_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Purchase Obligation, Increase in Amount, If 10% Increase in Revenue

+ References

No definition available.

+ Details

Name:	upld_PurchaseObligationIncreaseinAmountIf10IncreaseinRevenue
Namespace Prefix:	upld_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Related Party Transaction Number Of Agreements

+ References

No definition available.

+ Details

Name:	upld_RelatedPartyTransactionNumberOfAgreements
Namespace Prefix:	upld_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

+ References

No definition available.

+ Details

Name:	us-gaap_PurchaseObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of transactions with related party during the financial reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864

+ Details

Name:	us-gaap_RelatedPartyTransactionAmountsOfTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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

- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07.1(c))
-URI http://asc.fasb.org/extlink&oid=114873854&loc=SL114874292-224272

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

+ Details

Name:	us-gaap_RevenueFromRelatedParties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	srt_OwnershipAxis=upld_VisionaelCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TitleOfIndividualAxis=upld_ChiefExecutiveOfficerAndBoardOfDirectorsChairmanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_InvestorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=upld_SoftwareDevelopmentServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=upld_ServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=upld_ManagementHRPayrollandAdministrativeServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=upld_FormerSubsidiaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Related Party Transactions (Details)		3 Months Ended		12 Months Ended
Related Party Transactions (Details)	Mar. 28, 2017	Mar. 31, 2019 USD ($) agreement	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)
Related Party Transaction [Line Items]
Agreements \| agreement		2
Purchase obligation increase in amount, if a 10% increase in revenue		$ 500,000
Visionael Corporation \| Chief Executive Officer And Board Of Directors Chairman
Related Party Transaction [Line Items]
Percentage of ownership		26.18%
Forecast
Related Party Transaction [Line Items]
Purchase commitment, amount				$ 5,400,000
Investor
Related Party Transaction [Line Items]
Ownership percentage, minimum		5.00%
Amount of related party transaction		$ 1,200,000	$ 800,000
Software Development Services \| Investor
Related Party Transaction [Line Items]
Option to renew purchase commitment, term (in years)	1 year
Purchase obligation outstanding		4,900,000
Services \| Investor
Related Party Transaction [Line Items]
Purchase obligation outstanding		0
Amount of related party transaction		1,000,000	800,000
Management, HR/Payroll and Administrative Services \| Former Subsidiary
Related Party Transaction [Line Items]
Revenue from related party		$ 15,000	$ 15,000