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Share-based compensation - Schedule of Stock Options Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Number of options
Number of options, beginning balance	222,000
Number of options, expired	(110,000)
Number of options, ending balance	112,000	222,000
Options vested and expected to vest	112,000
Options exercisable	112,000
Weighted average exercise price per share
Weighted average exercise price per share, beginning balance	$ 12.59
Weighted average exercise price per share, expired	11.17
Weighted average exercise price per share, ending balance	13.98	$ 12.59
Options vested and expected to vest	13.98
Weighted average exercise price per share, options exercisable	$ 13.98
Weighted average remaining contractual term, options outstanding	3 years 1 month 18 days	5 years 4 months 24 days
Options vested and expected to vest	3 years 1 month 18 days
Weighted average remaining contractual term, options exercisable	3 years 1 month 18 days
Aggregate intrinsic value, beginning balance	$ 0
Aggregate intrinsic value, ending balance	0	$ 0
Aggregate intrinsic value, options vested and expected to vest	0
Aggregate intrinsic value, options exercisable	$ 0

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- Definition

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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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

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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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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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