Commitments And Contingencies (Narrative) (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Warranty liability	$ 0	$ 0
Perpetual Software Indemnification Agreement [Member]
Loss Contingencies [Line Items]
Indemnification liability	0	0
Officers And Directors Indemnification Agreement [Member]
Loss Contingencies [Line Items]
Indemnification liability	$ 0	$ 0

Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)(1),(c)(5)
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

Name:	us-gaap_StandardProductWarrantyAccrual
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant