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Share-based compensation - Schedule of Recognized Compensation Costs (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Total compensation costs | $ 2,310 | $ 5,428 | $ 5,294
Sales and marketing expenses [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Total compensation costs | 185 | 381 | 404
General and administrative expenses [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Total compensation costs | 1,209 | 2,453 | 2,245
Research and development expenses [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Total compensation costs | $ 916 | $ 2,594 | $ 2,645

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