The Company and Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details)	12 Months Ended
Dec. 31, 2017 USD ($)
ASU 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Tax benefit (expense)	$ 0

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.

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