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Debt - Iliad Note (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Nov. 25, 2019 | Apr. 30, 2021 | Dec. 31, 2020 | Jan. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Purchase price |  | $ 1,500,000 |  |  |  |  |  |
Percentage of gross proceeds used to make payments on note |  |  |  | 10.00% |  |  |  |
Gross proceeds |  |  |  | $ 275,000 |  |  |  |
Payments on the Iliad Note |  |  |  |  | $ 0 | $ 450,000 | $ 0 | $ 976,000
Iliad Note |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount | $ 1,300,000 |  |  |  |  |  |  |
Issue discount | 142,000 |  |  |  |  |  |  |
Purchase price | 1,100,000 |  |  |  |  |  |  |
Unamortized debt issuance costs | $ 15,000 |  |  |  |  |  |  |
Write off of remaining issuance costs |  |  | $ 117,000 |  |  |  |  |
Interest rate | 8.00% |  |  |  |  |  |  |
Percentage of gross proceeds used to make payments on note | 10.00% |  |  |  |  |  |  |
Payments on the Iliad Note |  |  |  | $ 226,000 |  |  |  |
Total liability, net of discount and financing fees |  |  |  |  |  | 200,000 |  | 200,000
Unamortized issuance costs at date of issuance |  |  |  |  |  | $ 100,000 |  | $ 100,000

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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