Derivative Warrants - Warrants Outstanding Reconciliation (Details) - Warrant - shares shares in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Increase (Decrease) in Temporary Equity [Roll Forward]
Outstanding at the beginning of the period (in shares)	118	118
Issued (in shares)	0	0
Exercised (in shares)	0	0
Outstanding at the end of the period (in shares)	118	118