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Commitments and contingencies - Summary of Significant Contractual Obligations and Commercial Commitments (Details) - USD ($) | Dec. 31, 2018 | May 31, 2018 | Jul. 31, 2017
--- | --- | --- | ---
Operating Leased Assets [Line Items] |  |  |
Total | $ 338,414 |  |
Less than 1 year | 122,858 |  |
Office Space Located in Maynard, Massachusetts |  |  |
Operating Leased Assets [Line Items] |  |  |
Total | 278,000 |  | $ 332,824
Less than 1 year | 63,000 |  |
1-3 years | 131,000 |  |
3-5 years | 84,000 |  |
More than 5 years | 0 |  |
Panama Farm Site |  |  |
Operating Leased Assets [Line Items] |  |  |
Total | 60,000 | $ 180,000 |
Less than 1 year | 60,000 |  |
1-3 years | 0 |  |
3-5 years | 0 |  |
More than 5 years | 0 |  |
Indiana auto lease [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Total | 11,000 |  |
Less than 1 year | 5,000 |  |
1-3 years | 6,000 |  |
3-5 years | 0 |  |
More than 5 years | 0 |  |
Indiana well lease [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Total | 717,000 |  |
Less than 1 year | 15,000 |  |
1-3 years | 32,000 |  |
3-5 years | 33,000 |  |
More than 5 years | 637,000 |  |
Significant Contractual Obligations and Commercial Commitments [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Total | 1,066,000 |  |
Less than 1 year | 143,000 |  |
1-3 years | 169,000 |  |
3-5 years | 117,000 |  |
More than 5 years | $ 637,000 |  |

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