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Income Tax (Tables) | 6 Months Ended
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Jun. 30, 2020
Income tax |
Schedule of Loss (Income) Before Income Taxes | Loss (income) before income taxes consists of:
​ | ​ | ​ | ​ | ​
​ | ​ | Six months ended June 30,
​ |  | 2019 |  | 2020
​ | ​ | $ | ​ | $
​ | ​ | (Unaudited) | ​ | ​
Cayman | ​ | (189) | ​ | 591
BVI | ​ | — | ​ | —
PRC | ​ | 76,299 | ​ | 112,320
HK | ​ | 3,109 | ​ | 4,983
US | ​ | 4,047 | ​ | 10,336
AUST | ​ | 8 | ​ | 387
​ | ​ | 83,274 | ​ | 128,617
Schedule of Reconciliations of PRC Statutory Income Tax Rate and Group's Effective Income Tax Rate | Reconciliations of the differences between the PRC statutory income tax rate and the Group’s effective income tax rate for the six months ended June 30, 2019 and 2020 are as follows:
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six months ended June 30, |
​ |  | 2019 |  | 2020 |
​ |  | (Unaudited) | ​ | ​ | ​
Statutory income tax rate |  | 25% |  | 25% | ​
Share-based compensations |  | (1.11%) | ​ | (1.02%) | ​
Non-deductible expenses |  | (0.13%) |  | (0.40%) | ​
Prior year tax filing adjustment |  | 1.50% |  | 1.85% | ​
Effect of different tax rate of subsidiary operation in other jurisdictions |  | (0.77%) |  | (0.52%) | ​
Preferential tax rate |  | (8.92%) |  | (8.72%) | ​
Effect of change in tax rate |  | (7.12%) |  | — | ​
Changes in valuation allowance |  | (8.45%) |  | (16.19%) | ​
Effective income tax rate |  | — |  | — | ​
Schedule of Components of Deferred Tax Assets and Liabilities | The principal components of the deferred tax assets and liabilities are as follows:
​ | ​ | ​
​ | ​ | Six months ended June 30,
​ |  | 2020
​ | ​ | $
​ | ​ | ​
Deferred tax assets: | ​ |
Depreciation of property and equipment, net | ​ | 69
Government grants | ​ | 372
Deferred revenue | ​ | 1,907
Net operating loss forwards | ​ | 102,579
Less: valuation allowance | ​ | (104,927)
Deferred tax assets, net | ​ | —
Schedule of Movement of Valuation Allowance | Movement of the valuation allowance is as follows:
​ | ​ | ​ | ​ | ​
​ | ​ | Six months ended June 30,
​ |  | 2019 |  | 2020
​ | ​ | $ | ​ | $
​ | ​ | (Unaudited) | ​ | ​
Balance as of January 1, | ​ | (49,928) | ​ | (63,215)
Additions | ​ | (16,471) | ​ | (41,712)
Balance as June 30 | ​ | (66,399) | ​ | (104,927)

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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure of valuation allowances to reduce deferred tax assets to net realizable value, including identification of the deferred tax asset more likely than not will not be fully realized and the corresponding amount of the valuation allowance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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