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Convertible Subordinated Notes (Narrative) (Details) - USD ($) | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 12, 2021 | Sep. 09, 2020 | Apr. 04, 2019 | Dec. 24, 2018 | May 07, 2018 | Mar. 19, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Amortization of debt issuance costs | $ 576,000 | $ 782,000 | $ 392,000 |  |  |  |  |  |
Convertible Preferred Stock, Nonredeemable or Redeemable, Issuer Option, Value |  |  |  | $ 2,400,000 | $ 3,800,000 |  |  | $ 115,000,000 | $ 143,750,000
Payments for Repurchase of Redeemable Convertible Preferred Stock, Cash Payment | 3,800,000 |  |  |  |  |  |  |  |
Additional Paid-in Capital |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Other | (1,400,000) |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Other | $ 1,400,000 |  |  |  |  |  |  |  |
Convertible subordinated notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest Rate, Unamortized Debt Discount and Debt Issuance Costs, Effective Percentage | 3.10% | 3.10% |  |  |  |  |  |  |
Debt instrument interest rate (in percent) |  |  |  |  |  |  |  |  | 2.75%
Interest expense | $ 18,000 | $ 149,000 | 174,000 |  |  |  |  |  |
Amortization of debt issuance costs | $ 1,000 | $ 20,000 | $ 24,000 |  |  |  |  |  |
Interest Rate, Unamortized Debt Discount, Effective Percentage | 11.40% | 11.40% |  |  |  |  |  |  |
Convertible Subordinated Debt |  |  |  |  |  | $ 25,000 | $ 22,400,000 |  |
Principal amount | $ 0 | $ 2,559,000 |  | $ 200,000 |  |  |  |  |

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- Definition Including the current and noncurrent portions, the carrying value of convertible subordinated debt, as of the balance sheet date, initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. This form of debt can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder, and places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. + 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(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: 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 Reference 3: 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)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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