Stockholders' Equity (Deficit) - Warrant Activity (Details) - shares	6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Class of Warrant or Right [Line Items]
Exercised (in shares)	0	(858,344)
Warrants Fundraising
Class of Warrant or Right [Line Items]
Warrants outstanding, beginning balance (in shares)	38,111,211	3,789,482	3,789,482
Issued (in shares)	17,000,000		39,199,998
Exercised (in shares)	0		(4,818,269)
Expired (in shares)	(610,000)		(60,000)
Warrants outstanding, ending balance (in shares)	54,501,211		38,111,211