Subsequent Events (Details) - Comcast Milestone Acceptance Of Completion Of Field Trials [Member] - Subsequent Event [Member] $ in Millions	Jul. 31, 2018 USD ($) shares
Subsequent Event [Line Items]
Warrant Shares Vested And Exercisable \| shares	1,172,425
Fair Value of Warrants On Vesting Date Using Black-Scholes Option Model \| $	$ 2.3

Fair value of share-based compensation granted to nonemployees as payment for services rendered or acknowledged claims.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Name:	us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration