Related party transactions and balances - Related party (Details) - USD ($) |
Sep. 30, 2017 |
Dec. 31, 2016 |
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| Related Party Transaction [Line Items] | ||
| Balance of advances from stockholders | $ 647,184 | $ 557,549 |
| Gold Street Capital Corp. [Member] | ||
| Related Party Transaction [Line Items] | ||
| Balance of advances from stockholders | 30,163 | 1 |
| Doriana Gianfelici [Member] | ||
| Related Party Transaction [Line Items] | ||
| Balance of advances from stockholders | 57,886 | 51,819 |
| Luca Pasquini [Member] | ||
| Related Party Transaction [Line Items] | ||
| Balance of advances from stockholders | 76 | 5,260 |
| Other Stockholders [Member] | ||
| Related Party Transaction [Line Items] | ||
| Balance of advances from stockholders | $ 559,059 | $ 500,469 |
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