Common Stock Warrants - Schedule Of Warrants Outstanding Roll Forward (Details) - shares	1 Months Ended		3 Months Ended	12 Months Ended
	Aug. 31, 2015	Feb. 28, 2015	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Shares
Beginning balance (in shares)				785,000	785,000	2,188,000
Warrants exercised (in shares)	(62,500)	(27,777)	(90,277)	(90,000)	0	(361,425)
Warrants forfeited or expired (in shares)					0	(1,042,000)
Ending balance (in shares)			695,000	695,000	785,000	785,000