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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Total compensation costs | $ 5,428 | $ 5,294 | $ 8,330
Sales and marketing expenses [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Total compensation costs | 381 | 404 | 88
General and administrative expenses [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Total compensation costs | 2,453 | 2,245 | 5,800
Research and development expenses [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Total compensation costs | $ 2,594 | $ 2,645 | $ 2,442

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