CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Statement Of Stockholders Equity [Abstract]
Common and preferred stock and warrants offering costs		$ 2.6
Warrants issuance cost		$ 0.1
Common stock public offering cost	$ 3.8