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Summary of significant accounting policies - Immaterial Correction of an Error (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Weighted average number of shares outstanding:
Basic (in shares)	79,388,383	78,196,959	79,297,599	74,885,746
Diluted (in shares)	81,132,304	78,196,959	80,443,530	74,885,746
Basic:
Continuing operations (in usd per share)	$ 0.01	$ 0.03	$ 0.02	$ (0.04)
Discontinued operations (in usd per share)	0.00	0.00	0.00	(0.28)
Net income (loss) - basic (in usd per share)	0.01	0.03	0.02	(0.32)
Diluted:
Continuing operations (in usd per share)	0.01	0.03	0.02	(0.04)
Discontinued operations (in usd per share)	0.00	0.00	0.00	(0.28)
Net income (loss) - diluted (in usd per share)	$ 0.01	$ 0.03	$ 0.02	$ (0.32)
Previously Reported
Weighted average number of shares outstanding:
Basic (in shares)		75,282,042		71,318,930
Diluted (in shares)		78,196,959		71,318,930
Basic:
Continuing operations (in usd per share)		$ 0.04		$ (0.04)
Discontinued operations (in usd per share)		0.00		(0.30)
Net income (loss) - basic (in usd per share)		0.04		(0.34)
Diluted:
Continuing operations (in usd per share)		0.03		(0.04)
Discontinued operations (in usd per share)		0.00		(0.30)
Net income (loss) - diluted (in usd per share)		$ 0.03		$ (0.34)
Restatement Adjustment
Weighted average number of shares outstanding:
Basic (in shares)		78,196,959		74,885,746
Diluted (in shares)		78,196,959		74,885,746
Basic:
Continuing operations (in usd per share)		$ 0.03		$ (0.04)
Discontinued operations (in usd per share)		0.00		(0.28)
Net income (loss) - basic (in usd per share)		0.03		(0.32)
Diluted:
Continuing operations (in usd per share)		0.03		(0.04)
Discontinued operations (in usd per share)		0.00		(0.28)
Net income (loss) - diluted (in usd per share)		$ 0.03		$ (0.32)

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