Summary of Significant Accounting Policies - Revenue Recognition (Details)	12 Months Ended
Dec. 31, 2016
Minimum
Deferred Revenue Arrangement [Line Items]
Revenue recognition period	1 year
Maximum
Deferred Revenue Arrangement [Line Items]
Revenue recognition period	2 years

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