Stockholders' Equity - (Details) $ / shares in Units, $ in Millions	1 Months Ended
	Feb. 28, 2018 USD ($) $ / shares shares
Sale of common stock
Number of shares sold | shares	3,772,447
Offering price | $ / shares	$ 7.00
Proceeds from stock offering, net of offering costs	$ 24.6
Offering costs	$ 1.8