Acquisitions - Asset Acquisition (Details) - Marketech Asset Acquisition $ in Millions	Mar. 21, 2018 USD ($)
Schedule Of Asset Acquisition [Line Items]
Payments for asset acquisitions	$ 2.0
Future earn-out payments	1.0
Earnout consideration liability	$ 0.3

Asset Acquisition, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High

No definition available.

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