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Note C - Debt Obligations (Details Textual) - USD ($) |  |  |  |  |  |  |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2022 | Feb. 08, 2021 | Jan. 12, 2021 | Jan. 01, 2021 | Apr. 23, 2020 | Jan. 13, 2020 | Dec. 18, 2019 | Feb. 09, 2016 | Jun. 02, 2014 | Jun. 30, 2018 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2021 | Jun. 18, 2021 | Mar. 31, 2021 | Jan. 26, 2021 | Dec. 31, 2019 | Sep. 30, 2019 | Sep. 02, 2019 | Jun. 30, 2016
Convertible Notes Payable, Total |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  | $ 0 |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 20,000,000.0 |  |  |  |  |  |  |  |  |  | 20,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,777,437 |  |  |  |  |  |  |  |  |
Interest Paid, Excluding Capitalized Interest, Operating Activities |  |  |  |  |  |  |  |  |  |  | 165,000 | $ 213,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Minimum Conversion Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.328 |  |  |
Line of Credit Facility, Maximum Amount Outstanding During Period |  |  |  |  |  |  |  |  |  |  | 12,800,000 |  |  |  |  |  |  |  |  |  |  |
Certificates of Deposit, at Carrying Value |  |  |  |  |  |  |  |  |  |  | 12,800,000 |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  |  |  |  |  |  |  | $ 7,200,000 |  |  |  |  |  |  |  |  |  |  |
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion from Deerfield Convertible Note to Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Original Debt, Amount |  |  |  |  |  |  |  |  |  | $ 3,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Accrued Interest |  |  |  |  |  |  |  |  |  | $ 200,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in shares) |  |  |  |  |  |  |  |  |  | 37,410 |  |  |  |  |  |  |  |  |  |  |  |
Conversion of December 2019 Notes into Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Original Debt, Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 17,100,000 |  |  |  |  |  |  |  |  |
December 2020 Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Original Debt, Amount |  |  | $ 31,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in shares) |  |  | 31,476.98412 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Warrants or Options Issued (in shares) |  |  | 3,632,019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deerfield Convertible Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 93.60 |  |  |
2021 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) |  |  |  |  |  |  |  | $ 17.11 |  |  |  |  |  | $ 273.76 |  |  |  |  |  |  |  |
Debt Conversion, Original Debt, Amount |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in shares) |  |  |  |  |  |  |  | 58.4454 |  |  |  |  |  | 3.6528 |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 5.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | $ 86,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Debt, Net of Issuance Costs |  |  |  |  |  |  |  | 82,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt, Total |  |  |  |  |  |  |  | 18,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Sinking Fund Payment |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Repurchase Price Equal to Percentage of Principal Amount |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Cancellation of Debt, Amount |  |  |  |  |  | $ 3,000,000.0 | $ 71,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Paid, Excluding Capitalized Interest, Operating Activities |  |  |  |  |  | $ 37,000 | $ 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Percentage of Accrued Interest Paid |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The 2019 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) |  |  |  |  |  | $ 5.85 | $ 17.11 |  |  |  |  |  |  | $ 93.60 |  |  |  |  | 273.76 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 6.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 71,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Percentage of Accrued Interest Paid |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Minimum Conversion Price (in dollars per share) |  |  |  |  |  | $ 0.583 |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.38 |  |  |
Debt Instrument, Convertible, Conversion Restriction Percentage of Common Stock |  |  |  |  |  |  | 4.985% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beneficial Ownership, Cap Limit, Percentage |  |  |  |  |  |  | 19.985% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Floor Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.328 |  |  |  |  |  |  |  |
January 2020 Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 3,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The December 2020 Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  | $ 30,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The December 2019 and January 2020 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 60,800,000 |  |  |  |  |  |  |  |
Deerfield Facility Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,500,000 |  |  |  |  |  |  |  |
The Facility Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt, Total |  |  | $ 30,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Total |  |  | $ 7,600,000 |  |  |  |  |  |  |  |  |  |  | $ 69,400,000 |  |  |  |  |  |  |  |
Paycheck Protection Program CARES Act [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt, Total |  |  |  |  | $ 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deerfield Facility Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  | $ 60,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Interest Rate at Period End |  |  |  |  |  |  |  |  | 9.75% |  |  |  |  |  |  |  |  |  |  |  |  | 6.75%
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.75% | 9.75% |
Convertible Notes Payable, Current |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,000,000.0 |  |  |  |  |
Debt Covenant, Debt Financing Restriction |  |  |  |  |  |  |  |  | $ 750,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt, Total |  | $ 8,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Minimum Conversion Price (in dollars per share) |  |  |  |  |  |  | $ 0.60 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Maximum Shares Issued (in shares) |  |  |  |  |  |  | 28,439,015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Optional Conversion Feature, Exchange Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.60 |  |  |  |  |  |  |  |
Debt Instrument, Convertible Optional Conversion Feature Shares Issuable Upon Exchange (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,777,437 |  |  |  |  |  |  |  |
Deerfield Facility Agreement [Member] | Deerfield Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.78 |  |  |  |  |  |  |  |  |  |  |  |  |
Deerfield Facility Agreement [Member] | Deerfield Warrant [Member] | IPO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  | 1,923,077 |  |  |  |  |  |  |  |  |  |  |  |  |
Deerfield Facility Agreement [Member] | Series D Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  | 14,423,076 |  |  |  |  |  |  |  |  |  |  |  |  |
Deerfield Facility Agreement [Member] | Term Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Secured Notes Payable |  |  |  |  |  |  |  |  | $ 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Deerfield Facility Agreement [Member] | Deerfield Convertible Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Secured Notes Payable |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) |  |  |  |  |  |  |  |  | $ 5.85 |  |  |  |  | $ 93.60 |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 120,192 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  |  |  | $ 5.85 |  |  |  |  | $ 93.60 |  | $ 38.34 |  | $ 46.25 |  |  |  |

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- Definition The amount of accrued interest that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References No definition available. + Details
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- Definition A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder. + References Reference 1: 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 https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(13)) -URI https://asc.fasb.org/extlink&oid=120401414&loc=d3e603758-122996 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 https://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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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- Definition Carrying value as of the balance sheet date of the portion of long-term debt due within one year or the operating cycle if longer identified as Convertible Notes Payable. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126999549&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126999549&loc=d3e4304-108586 + Details
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