Capital Stock (Details) $ / shares in Units, $ in Millions	1 Months Ended
	Apr. 30, 2018 USD ($) $ / shares shares
Class of Stock [Line Items]
Price per share issued (usd per share) | $ / shares	$ 9.25
Proceeds from public offering | $	$ 37.3
Underwritten Public Offering
Class of Stock [Line Items]
Issuance of common stock, net of issuance costs (shares)	4,312,500
Over-Allotment Option
Class of Stock [Line Items]
Issuance of common stock, net of issuance costs (shares)	562,500