Summary of Stock Option Activity Under Black-Scholes Option (Detail) - $ / shares	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Expected term		2 years 9 months
Expected volatility		53.01%
Risk-free interest rate		1.47%
Forfeiture rate		8.00%
Minimum [Member]
Expected term	11 months 5 days
Expected volatility	38.10%
Risk-free interest rate	1.64%
Market value of common stock	$ 0.52	$ 0.52
Annual dividend yield	2.23%	2.51%
Forfeiture rate	0.00%
Maximum [Member]
Expected term	1 year 9 months
Expected volatility	41.60%
Risk-free interest rate	1.86%
Market value of common stock	$ 0.76	$ 0.76
Annual dividend yield	3.53%	3.53%
Forfeiture rate	6.80%

Represents the forfeiture rate.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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