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v3.20.1

Taxation - Reconciliation of actual income tax expense and amount computed by applying the PRC statutory income tax rate (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
Taxation |  |  |  |
Income/(loss) before tax | $ (72,770) | ¥ (506,621) | ¥ 108,459 | ¥ 3,015
Income tax computed at PRC statutory tax rate |  | (126,655) | 27,115 | 754
Tax rate differential not subject to PRC income tax |  | (3,193) | (576) | 631
Non-deductible expense |  | 151,990 | 2,245 | 4,147
Effect of preferential tax rate (Note*) |  | 47,979 | (5,153) | (3,102)
Change in valuation allowance |  | (56,920) | (8,651) | 3,348
Additional deduction for research and development expenses |  | (9,700) | (8,732) | (3,412)
Tax-exempted income |  | (1,440) | (2,306) |
Late payment surcharge on uncertain tax position |  | 1,321 | 544 |
Other |  | 384 | (53) |
Income tax expense | $ 541 | ¥ 3,766 | ¥ 4,433 | ¥ 2,366
Statutory tax rate (as a percent) | 25.00% | 25.00% | 25.00% | 25.00%

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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(10)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(8)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(15)) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 + Details
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