Equity - Schedule of Rollforward of Unvested Stock Shares (Detail) - Series X Preferred Stock [Member]	12 Months Ended
Dec. 31, 2015 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested—December 31, 2014	558,862
Vested	(558,862)
Repurchased	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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