Fair Value Measurements - Summary of Changes in Level 3 Financial Instruments (Details) $ in Thousands	6 Months Ended
Jun. 30, 2017 USD ($)
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance, fair value	$ 388
Foreign currency translation	32
Ending balance, fair value	5,440
IDV Solutions LLC
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Contingent consideration from IDV acquisition	$ 5,020

Fair value measurement with unobservable inputs reconciliation recurring basis liability contingent consideration from acquisition.

No definition available.

+ Details

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- Definition

Fair value measurement with unobservable inputs reconciliation recurring basis liability foreign currency translation.

+ References

No definition available.

+ Details

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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.

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- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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