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Stockholders' Equity - Stock Option Activity (Detail) - $ / shares		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock Options, Number of Options [Roll Forward]
Outstanding, beginning of period (in shares)	[1]	0	0	0
Granted (in shares)	[1]	0	0	0
Forfeited (in shares)	[1]	0	0	0
Outstanding, end of period (in shares)	[1]	0	0	0	0
Exercisable (in shares)	[1]	0
Stock Options, Exercise Price per Share [Roll Forward]
Granted (in dollars per share)	[1]	$ 0		$ 0
Forfeited (in dollars per share)	[1]	0
Stock Options, Weighted Average Exercise Price [Roll Forward]
Outstanding, beginning of period (in dollars per share)	[1]	0	$ 0	0
Granted (in dollars per share)	[1]	0		0
Forfeited (in dollars per share)	[1]	0	0	0
Outstanding, end of period (in dollars per share)	[1]	0	$ 0	$ 0	$ 0
Exercisable (in dollars per share)	[1]	$ 0
Stock Options, Weighted Average Remaining Life Years [Abstract]
Outstanding	[1]	0 years	0 years	0 years	0 years
Exercisable	[1]	0 years
Minimum [Member]
Stock Options, Exercise Price per Share [Roll Forward]
Outstanding, beginning of period (in dollars per share)	[1]	$ 0	$ 0	$ 0
Forfeited (in dollars per share)	[1]		0	0
Outstanding, end of period (in dollars per share)	[1]	0	0	0	$ 0
Exercisable (in dollars per share)	[1]	0
Maximum [Member]
Stock Options, Exercise Price per Share [Roll Forward]
Outstanding, beginning of period (in dollars per share)	[1]	0	0	0
Forfeited (in dollars per share)	[1]		0	0
Outstanding, end of period (in dollars per share)	[1]	0	$ 0	$ 0	$ 0
Exercisable (in dollars per share)	[1]	$ 0
[1] Due to the May 2, 2018 1-for-500 reverse stock split, and no fractional shares being issued, all numbers are reduced to zero.

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Share based compensation arrangement by share based payment award options exercisable exercise price per share.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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