Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions	Mar. 31, 2018 USD ($)
Licenses \| Prepaid Expenses and Other Current Assets
Finite Lived Intangible Assets [Line Items]
Content assets	$ 0.1

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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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration