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Share Repurchase - Additional Information (Details) ¥ in Thousands, $ in Thousands	1 Months Ended		12 Months Ended
	Apr. 30, 2017 CNY (¥) shares	Apr. 30, 2017 USD ($) shares	Dec. 31, 2017 CNY (¥) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2019 shares	Dec. 31, 2018 CNY (¥) shares	Dec. 31, 2017 USD ($) shares
Equity, Class of Treasury Stock [Line Items]
Repurchase of ordinary shares			¥ 31,280	$ 4,809
Treasury stock acquired, shares			99,347	99,347
Treasury shares canceled	1,246,073	1,246,073
Treasury shares canceled, value	¥ 121,452	$ 18,667
Ordinary shares, treasury stock			140,479		0	140,479	140,479
Treasury stock, value			¥ 40,267			¥ 40,267	$ 6,190
American Depositary Shares
Equity, Class of Treasury Stock [Line Items]
Treasury stock acquired, shares			198,694	198,694
Treasury shares canceled	2,492,146	2,492,146
Ordinary shares, treasury stock			280,958				280,958

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Amount of decrease of par value, additional paid in capital (APIC) and retained earnings of common and preferred stock retired from treasury when treasury stock is accounted for under the cost method.

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