Commitments and Contingencies - Legal Proceedings (Details) - TelexFree Matter - Propay		3 Months Ended
Oct. 21, 2014 claim	Mar. 31, 2018 defendant
Commitments and Contingencies
Number of additional claims \| claim	4
Minimum
Commitments and Contingencies
Number of defendants \| defendant		1

The total number of new claims filed pertaining to a loss contingency during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

Name:	us-gaap_LossContingencyNewClaimsFiledNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration