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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 |  |

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- Definition Class Of Warrant Or Right, Warrants Issued + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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