Stock Based Compensation - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Weighted Average Grant Date Fair Value per Option
Number of options exercisable at December 31, 2019	3,069,000
Weighted average exercise price per option, exercisable (in usd per share)	$ 2.35
Weighted average remaining contractual term, exercisable	5 years 4 months 24 days
Stock Option | Directors, officers consultants and employees
Number of Options
Number of options outstanding, beginning balance (in shares)	3,867,621	3,851,371
Number of options granted (in shares)	2,450,000	340,000
Number of options exercised (in shares)	(736,552)	(52,500)
Number of options forfeited (in shares)	(907,500)	0
Number of options exercised (in shares)	(948,569)	(271,250)
Number of options outstanding, ending balance (in shares)	3,725,000	3,867,621
Weighted Average Exercise Price per Option
Weighted average exercise price per option outstanding, beginning balance (in usd per share)	$ 4.05	$ 3.11
Weighted average exercise price per option outstanding, grants in period (in usd per share)	0.96	1.18
Weighted average exercise price per option outstanding, exercised in period (in usd per share)	0.72	1.24
Weighted average exercise price per option outstanding, forfeitured in period (in usd per share)	4.49
Weighted average exercise price per option outstanding, expirations in period (in usd per share)	5.01	3.22
Weighted average exercise price per option outstanding, ending balance (in usd per share)	2.32	4.05
Weighted Average Grant Date Fair Value per Option
Weighted average grant date fair value per option, grants in period (in usd per share)	$ 0.51	$ 0.54