Stockholders' Equity - Issuance of Common Stock and Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended
	Nov. 29, 2019	Jan. 31, 2020	Mar. 31, 2020	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class Of Warrant Or Right, Warrants Issued			3,682,729
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 0.125
Amount paid for clearing fees		$ 231
Offering Costs			$ 474
Proceeds from the Issuance of Common Stock and Warrants, Net of Issuance Costs			2,300
Proceeds from Issuance or Sale of Equity			275
Payments on the Iliad Note			$ 226	$ 0
Debt Instrument, Proceeds To Be Paid To Lender, Percent			10.00%
Note Purchase Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payments on the Iliad Note			$ 226
Debt Instrument, Proceeds To Be Paid To Lender, Percent	10.00%
Institutional Investor [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class Of Warrant Or Right, Warrants Issued			3,441,803
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 0.674
Private Placement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class Of Warrant Or Right, Warrants Issued			240,926
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 0.9988
Amount paid for placement agent commissions		193
Amount paid related to expenses for registered direct offering and concurrent private placement		$ 50