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Business Combinations - Schedule of Intangible Assets Acquired (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018
Customer relationships
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortization Period	4 years 9 months 18 days	4 years 9 months 18 days
A2iA
Acquired Indefinite-lived Intangible Assets [Line Items]
Amount assigned	$ 28,610
A2iA | Completed technologies
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortization Period	7 years
Amount assigned	$ 13,015
A2iA | Customer relationships
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortization Period	5 years
Amount assigned	$ 15,360
A2iA | Trade names
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortization Period	5 years
Amount assigned	$ 235
ICAR
Acquired Indefinite-lived Intangible Assets [Line Items]
Amount assigned	$ 6,407
ICAR | Completed technologies
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortization Period	5 years
Amount assigned	$ 4,956
ICAR | Customer relationships
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortization Period	2 years
Amount assigned	$ 1,298
ICAR | Trade names
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortization Period	3 years
Amount assigned	$ 153

X

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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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

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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