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Stockholders' equity - Compensation Costs Recognized on Financial Statements (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Total share-based compensation | $ 263,396 | $ 122,134 | $ 218,294
Research and development |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Total share-based compensation | 3,238 | 3,168 | 2,115
Sales and marketing |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Total share-based compensation | 0 | 9,315 | 65,517
General and administrative |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Total share-based compensation | $ 260,158 | $ 109,651 | $ 150,662

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