Stockholders' Equity - Common Stock Warrant Activity (Details)	12 Months Ended
	Dec. 31, 2019 $ / shares shares	Dec. 31, 2018 $ / shares
Class of Warrant or Right
Outstanding warrants, beginning of period	2,768,882
Exercised	(38,366)
Outstanding warrants, end of period	5,098,916
Warrant exercise price (per share) | $ / shares	$ 0.75	$ 0.08
Warrant exercise price per share, expired | $ / shares	0.08
Expiration Date - November 2017
Class of Warrant or Right
Issued	2,368,400
Warrant exercise price (per share) | $ / shares	$ 1.52