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v3.21.1

Summary of significant accounting policies - Additional Information (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 01, 2018 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
Accounting Policies and General Information [Line Items] |  |  |  |  |  |  |
Allowance for doubtful accounts |  |  | $ 9,329,000 | $ 7,604,000 | $ 7,709,000 | $ 31,000 |
Impairment of long-term investments |  |  | $ 794,000 | 19,831,000 | 7,794,000 |  |
Cash flow projection period |  |  | 5 years |  |  |  |
Discount rate |  |  | 18.20% |  |  |  |
Terminal Growth Rate to extrapolate the cash flows beyond five-year period |  |  | 2.00% |  |  |  |
Goodwill impairment losses |  |  | $ 0 | 0 | 0 |  |
Sales rebates provided to the agencies and advertisers |  |  | 0 | 0 | 394,000 |  |
External advertising and market promotion expenses from continuing operations |  |  | $ 11,026,000 | 20,974,000 | 22,935,000 |  |
Value added tax on revenues | 17.00% | 16.00% | 13.00% |  |  |  |
Value added tax on sub-licensing revenues |  |  | 6.00% |  |  |  |
Employee benefit costs |  |  | $ 7,949,000 | $ 12,337,000 | $ 12,501,000 |  |
Statutory general reserve rate |  |  | 10.00% |  |  |  |
Statutory general reserve rate of registered capital |  |  | 50.00% |  |  |  |
Dividends declared |  |  | $ 0 | $ 0 | $ 0 |  |
Income (Loss) from Equity Method Investments |  |  |  |  | $ (307,000) |  |
Right-of-use assets |  |  | $ 1,954,000 | $ 8,747,000 | 11,819,000 |  |
Lease liabilities |  |  | 1,988,000 | 8,825,000 |  |  |
Shenzhen Mojingou Information Service Co., Ltd [Member] |  |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |  |
Income (Loss) from Equity Method Investments |  |  | 0 | 0 | 317,000 |  |
Long-term Investments [Member] |  |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |  |
Impairment of long-term investments |  |  | 794,000 | 19,830,000 | $ 7,794,000 |  |
Income (Loss) from Equity Method Investments |  |  | $ 214,000 | $ 579,000 |  |  |
Minimum |  |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |  |
Term of time-based subscriptions |  |  | 1 month |  |  |  |
Maximum |  |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |  |
Term of time-based subscriptions |  |  | 12 months |  |  |  |
Advertising contract term |  |  | 3 months |  |  |  |
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] | China [Member] | Minimum |  |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |  |
Percent of revenue |  |  |  | 99.00% | 99.00% | 99.00% |
Accounting Standards Update 2016-02 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Revision of Prior Period, Adjustment [Member] |  |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |  |
Right-of-use assets |  |  |  |  |  |  | $ 11,800,000
Lease liabilities |  |  |  |  |  |  | $ 11,400,000
Land use right [Member] |  |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |  |
Other intangible assets, amortization period |  |  | 30 years |  |  |  |

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