Mezzanine and Shareholders' Equity - Warrants Narrative (Details) - USD ($) $ / shares in Units, $ in Millions				12 Months Ended
	Mar. 21, 2018	Mar. 30, 2016	Oct. 14, 2015	Dec. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Number of shares sold (in shares)	600,000
Warrants exercises in period (in shares)				177,405	286,357
Warrant issued during period value stock options exercised				$ 1.7	$ 2.2
Series B Preferred Stock
Class of Stock [Line Items]
Number of shares sold (in shares)		555,555
Exercise price per share (in dollars per share)		$ 10.00
Private Placement
Class of Stock [Line Items]
Number of shares sold (in shares)			1,111,111
Exercise price per share (in dollars per share)		$ 10.00	$ 9.00
Minimum
Class of Stock [Line Items]
Exercise price of warrants (in dollars per share)				$ 9.00	$ 4.00
Maximum
Class of Stock [Line Items]
Exercise price of warrants (in dollars per share)				$ 11.00	$ 11.00