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Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 10, 2014
Tax expense (benefit) for unrealized holding gain (loss) on available-for-sale investments | $ 0 | $ 0 | $ 0 | $ 0 |
3.25% Convertible Notes | Convertible Debt |  |  |  |  |
Stated interest rate |  |  |  |  | 3.25%

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