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Summary of Employee Share Option Activity (Detail) - 2010 Plan $ / shares in Units, ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 $ / shares shares	Dec. 31, 2017 CNY (¥) shares
Number of options
Outstanding, beginning balance | shares	2,031,940
Exercised (in shares) | shares	(332,754)
Outstanding, ending balance | shares	1,699,186	2,031,940
Vested and expected to vest at December 31, 2017 | shares	1,699,186		1,699,186
Exercisable as of December 31, 2017 | shares	1,699,186		1,699,186
Weighted average exercise price
Outstanding, beginning balance | $ / shares	$ 0.48
Exercised | $ / shares	0.41
Outstanding, ending balance | $ / shares	0.49	$ 0.48
Vested and expected to vest at December 31, 2017 | $ / shares	0.49
Exercisable as of December 31, 2017 | $ / shares	$ 0.49
Weighted average remaining contractual term
Outstanding, December 31, 2017	3 years 6 months	4 years 8 months 12 days
Vested and expected to vest at December 31, 2017	3 years 6 months
Exercisable as of December 31, 2017	3 years 6 months
Aggregate intrinsic value
Outstanding, December 31, 2017	$ 1,432		¥ 9,317
Vested and expected to vest at December 31, 2017 | $	1,432
Exercisable as of December 31, 2017 | $	$ 1,432

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

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. 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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