Net Loss per Share - Additional Information (Detail) - $ / one_hundred_dollars_of_preferred_stock		12 Months Ended
Feb. 14, 2017	Dec. 31, 2017
Series A preferred stock
Earnings Per Share [Line Items]
Cumulative annual dividends per $100	8	8

Preferred Stock, Dividend Rate, Per One Hundred Dollars Of Stock

No definition available.

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Period Type:	duration