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Debt (Terms of Revolver, Term Loans, and Delay Draw Term Loan) (Details) - Credit Agreement [Member] | 3 Months Ended |
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Mar. 31, 2017 USD ($) | Nov. 15, 2016 USD ($)
Line of Credit [Member] |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity | $ 90,000,000 |
Line of Credit [Member] | Maximum Revolver Amount [Member] |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity | $ 10,000,000.0 |
Multiplier used to calculate borrowing capacity (as a percent) | 1 |
Line of Credit [Member] | U.S. [Member] |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity | $ 500,000.0 |
Line of Credit [Member] | Canadian [Member] |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity | $ 250,000.00 |
Term Loan [Member] | U.S. [Member] |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity |  | $ 44,400,000.0
Quarterly payment, percentage of principal | 5.00% |
Term Loan [Member] | Canadian [Member] |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity |  | 5,600,000.0
DDTL [Member] |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity |  | $ 10,000,000.0
Quarterly payment, percentage of principal | 5.00% |

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- Definition Line of Credit Facility. Multiplier Used to Calculate Borrowing Capacity + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition Line of Credit Facility, Periodic Payment, Percentage of Principal + References No definition available. + Details
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Namespace Prefix: | upld_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- 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
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | credit
Period Type: | instant

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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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Period Type: |