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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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