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Debt (Loans) (Details) - Credit Agreement [Member] - USD ($) | Mar. 31, 2017 | Nov. 15, 2016
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Line of Credit [Member] |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity, including optional additional capacity |  | $ 90,000,000
Maximum borrowing capacity | $ 90,000,000 |
Additional borrowing capacity upon satisfaction of terms and conditions |  | 20,000,000.0
Maximum stock repurchase capacity | 8,300,000.0 |
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 |
Line of Credit [Member] | Subordinated, unsecured debt [Member] |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity | $ 16,700,000.0 |
Revolving Credit Facility [Member] | U.S. [Member] |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity |  | 9,000,000.0
Revolving Credit Facility [Member] | Canadian [Member] |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity |  | 1,000,000.0
Term Loan [Member] | U.S. [Member] |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity |  | 44,400,000.0
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

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- Definition Line of Credit Facility, Additional Borrowing Capacity Upon Satisfaction of Loan Covenants + References No definition available. + Details
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Namespace Prefix: | upld_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line of Credit Facility, Maximum Borrowing Capacity If Additional Capacity Is Accepted + References No definition available. + Details
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Namespace Prefix: | upld_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line of Credit, Maximum Stock Repurchase Capacity + References No definition available. + Details
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Namespace Prefix: | upld_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_DomesticLineOfCreditMember
Namespace Prefix: |
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- Details
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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