Description of Business and Summary of Significant Accounting Policies Revenue Recognition (Details) $ in Thousands	Mar. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Capitalized Contract Costs, net, Current	$ 870
Capitalized Contract Costs, net, Noncurrent	$ 1,400

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.

No definition available.

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