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Stockholders' equity - Recent Issuances (Details) - March 2019 Public Offering [Member] $ in Millions	1 Months Ended
	Mar. 31, 2019 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from public offering | $	$ 6.6
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issued (in shares) | shares	3,345,282

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- Definition

The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

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