Equity - Warrants (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended		12 Months Ended
	Jul. 17, 2019	May 31, 2016	Sep. 30, 2014	Dec. 31, 2019	Dec. 31, 2018	Oct. 31, 2015
Warrant
Number of Underlying Shares
Outstanding, beginning balance (in shares)				11,517,696	11,478,172
Dilution adjustment (in shares)				168,669	39,524
Expired (in shares)				(5,686,365)
Outstanding, end balance (in shares)				14,653,846	11,517,696
Weighted Average Exercise Price Per Share
Outstanding, beginning balance (in dollars per share)				$ 0.81	$ 0.81
Dilution adjustment (in dollars per share)				0.80	0.87
Expired during period (in dollar per share)				0.80
Outstanding, end balance (in dollars per share)				$ 0.39	$ 0.81
2014 Warrants
Number of Underlying Shares
Outstanding, beginning balance (in shares)
Dilution adjustment (in shares)				940,365
Outstanding, end balance (in shares)				5,686,365
Weighted Average Exercise Price Per Share
Outstanding, beginning balance (in dollars per share)
Outstanding, end balance (in dollars per share)				$ 0.80
May 2016 Warrants
Number of Underlying Shares
Exchanged during period (in shares)				(4,500,000)
Weighted Average Exercise Price Per Share
Exchanged during the period (in dollar per share)				$ 0.75
Series A Warrants
Number of Underlying Shares
Granted (in shares)				8,653,846
Weighted Average Exercise Price Per Share
Granted (in dollars per share)				$ 0.35
Outstanding, end balance (in dollars per share)	$ 0.33
Expiration term of warrant	5 years
Warrants exercise period	6 months
Series B Warrants
Number of Underlying Shares
Exchanged during period (in shares)				4,500,000
Weighted Average Exercise Price Per Share
Exchanged during the period (in dollar per share)				$ 0.35
Outstanding, end balance (in dollars per share)	$ 0.33
Warrants exercise period	6 months
Sentient
Weighted Average Exercise Price Per Share
Principal amount of loan						$ 5.0
Sentient | 2014 Warrants
Weighted Average Exercise Price Per Share
Outstanding, end balance (in dollars per share)			$ 1.21
Number of shares of common stock per capital unit (in shares)			1
Term of warrants			5 years
Registered Offering
Weighted Average Exercise Price Per Share
Sale price (in dollars per shares)		$ 0.50
Common stock issued (in shares)		8,000,000
Gross proceeds from common stock sale		$ 4.0
Registered Offering | 2016 Warrants
Number of Underlying Shares
Outstanding, end balance (in shares)		6,000,000
Weighted Average Exercise Price Per Share
Number of shares of common stock per capital unit (in shares)		0.75
Term of warrants		5 years
LPC Program
Weighted Average Exercise Price Per Share
Sale price (in dollars per shares)				$ 0.28
Common stock issued (in shares)				2,113,642
LPC Program | May 2016 Warrants
Weighted Average Exercise Price Per Share
Outstanding, end balance (in dollars per share)	$ 0.75
LPC Program | Series A Warrants
Weighted Average Exercise Price Per Share
Outstanding, end balance (in dollars per share)	$ 0.35
Common shares issuable upon exercise	8,653,846
LPC Program | Series B Warrants
Weighted Average Exercise Price Per Share
Outstanding, end balance (in dollars per share)	$ 0.35
Number of common shares which can be purchased with each warrant	1
Common shares issuable upon exercise	4,500,000
Common Stock
Weighted Average Exercise Price Per Share
Common stock issued (in shares)				8,653,846	3,153,808
Common Stock | LPC Program
Weighted Average Exercise Price Per Share
Common stock issued (in shares)	8,653,846