Stockholders' Equity – Public Offering (Details) - USD ($) $ / shares in Units, $ in Millions	Dec. 13, 2019	Dec. 11, 2019	Dec. 31, 2019	Dec. 31, 2018
Public Offering
Common stock, par value (in dollars per share)			$ 0.001	$ 0.001
Common Stock
Public Offering
Shares issued	32,200,000
Net proceeds from issuance of common stock	$ 37.4
Stock issuance costs	$ 2.8
Public Offering | Common Stock
Public Offering
Shares issued		28,000,000
Common stock, par value (in dollars per share)		$ 0.001
Share Price (in dollars per share)		$ 1.25
Underwriter option | Common Stock
Public Offering
Shares issued	4,200,000