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Financial Instruments and Fair Value Measurements - Equity Investment in InCarda (Details) |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 15, 2022 USD ($) $ / shares shares | Mar. 09, 2022 USD ($) | Jun. 30, 2022 USD ($) Director $ / shares | Jun. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2022 USD ($) Director $ / shares | Jun. 30, 2021 USD ($) | Dec. 31, 2021 USD ($)
Equity Investment |  |  |  |  |  |  |  |
Equity and long-term investments |  |  | $ 494,097,000 |  |  | $ 494,097,000 |  | $ 483,845,000
InCarda |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Number of Investee's Board members currently representing the Company | Director |  |  | 1 |  |  | 1 |  |
Number of the Investee's Board members | Director |  |  | 8 |  |  | 8 |  |
Equity investment ownership percentage |  |  | 8.90% |  |  | 8.90% |  | 13.00%
Unrealized loss from fair value changes in equity investments |  |  |  | $ 300,000 |  |  | $ 700,000 |
Unrealized loss from fair value changes in equity investments |  |  | $ 9,600,000 |  |  | $ 9,000,000.0 |  |
InCarda | Series C preferred stock and warrants |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Amount of securities purchase agreement |  |  |  |  | $ 15,800,000 |  |  |
InCarda | Warrants |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Maximum number of additional shares into which warrants may be converted under the securities purchase agreement | shares |  |  |  |  | 5,117,358 |  |  |
Equity and long-term investments at fair value |  |  |  |  |  |  |  | $ 400,000
Exercise price of warrants | $ / shares |  |  | $ 0.7328 |  |  | $ 0.7328 |  |
Extended expiration date |  |  |  |  |  | Mar. 31, 2023 |  |
InCarda | Convertible note and warrants |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Amount of securities purchase agreement |  | $ 700,000 |  |  |  |  |  |
InCarda | Common stock |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Number of shares to be purchased under the securities purchase agreement | shares | 4,093,886 |  |  |  |  |  |  |
InCarda | Series A1 preferred stock |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued | shares | 37,350 |  |  |  |  |  |  |
InCarda | Series D 1 Preferred Stock |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Number of shares to be purchased under the securities purchase agreement | shares | 8,771,780 |  |  |  |  |  |  |
InCarda | Series D 2 Preferred Stock |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued | shares | 3,369,802 |  |  |  |  |  |  |
Exercise price of warrants | $ / shares | $ 0.26 |  |  |  |  |  |  |
InCarda | Series D2 Warrants |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued | shares | 2,490,033 |  |  |  |  |  |  |
InCarda | Series C preferred stock |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Number of shares to be purchased under the securities purchase agreement | shares |  |  |  |  | 20,469,432 |  |  |
Number of warrants purchased under the securities purchase agreement | shares |  |  |  |  | 5,117,358 |  |  |
Transaction cost |  |  |  |  | $ 800,000 |  |  |
Equity and long-term investments at fair value |  |  |  |  |  |  |  | 15,800,000
Impairment of equity investments |  |  |  |  |  | $ 9,000,000.0 |  | $ 0
Exercise price of warrants | $ / shares |  |  |  |  | $ 0.73 |  |  |
InCarda | Series C Preferred Stock and Series C and D Warrants |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Equity and long-term investments at fair value |  |  | $ 7,200,000 |  |  | 7,200,000 |  |
InCarda | Series D Preferred Stock |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Payments to acquire equity securities | $ 2,300,000 |  |  |  |  |  |  |
InCarda | Series D1 Preferred Stock, Series D2 Preferred Stock and Common Stock |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Equity and long-term investments at fair value |  |  | $ 3,200,000 |  |  | $ 3,200,000 |  |
InCarda | Significant Unobservable Inputs, Level 3 | Backsolve Valuation |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Risk free interest rate |  |  |  |  |  | 3.20% |  |
Dividend yield |  |  |  |  |  | 0.00% |  |
Estimated volatility |  |  |  |  |  | 122.00% |  |
InCarda Convertible Note |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |
Debt Instrument, annual interest rate |  | 6.00% |  |  |  |  |  |
Gross Proceeds from sale of equity |  | $ 10,000,000.0 |  |  |  |  |  |
Debt instrument principal amount percentage |  |  |  |  |  | 100.00% |  |

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