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Related Party Transactions - Registration Rights (Details) - Investor [Member]	Oct. 07, 2014 USD ($) offering
Related Party Transaction [Line Items]
Minimum market value of registrable shares	$ 150,000,000
Maximum number of underwritten offerings obligated to effect (offering) | offering	4
Share value cut back threshold	$ 25,000,000
Maximum reimbursement of liabilities arising under the Securities Act	25,000
Reimbursement of liabilities arising under the Securities Act	$ 500,000
ESRT [Member]
Related Party Transaction [Line Items]
Maximum number of underwritten offerings obligated to effect in a 12 month period (offering) | offering	2
Maximum number of underwritten offerings obligated to effect period	12 months

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- Definition

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- Definition

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- Definition

Related Party Transaction, Number of Underwritten Offerings Obligated to Effect in Twelve Month Period, Maximum

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- Definition

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- Definition

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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.

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