Revenue from Contracts with Customers - Narrative (Details)	12 Months Ended
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Time period of contractual future performance obligations for which value not disclosed (or less)	1 year
Time period of contractual future performance obligations	For these usage-based licenses, revenue is recognized as the performance obligations are performed over the contract term, which is generally two to five years.

Description of timing for satisfying performance obligation in contract with customer. Includes, but is not limited to, as services are rendered, and upon shipment, delivery or completion of service.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130554-203045

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