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Investment Securities Table (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value |  | $ 18,009 | $ 14,687 | [1]
Debt Securities, Available-for-sale, Amortized Cost |  | 25,181 | 27,661 |
Debt Securities, Available-for-sale, Amortized Cost, Current |  | 18,009 | 14,687 |
Debt Securities, Available-for-sale, Noncurrent |  | 7,172 | 12,974 |
Debt Securities, Available-for-sale |  | 25,181 | 27,661 |
Available-for-sale Debt Security Current [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Unrealized Loss | $ 0 | 0 |  |
Long-term Investments [Domain] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Noncurrent |  | 7,172 | 12,974 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 0 | 0 |
Debt Securities, Available-for-sale, Noncurrent |  | $ 7,172 | $ 12,974 |
[1] | December 31, 2020 balances were derived from audited consolidated financial statements.

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