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Financial Instruments and Fair Value Measurements - Equity Investment in InCarda (Details) - InCarda $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2020 USD ($) $ / shares shares | Jun. 30, 2021 USD ($) director | Jun. 30, 2021 USD ($) director | Dec. 31, 2020 USD ($)
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 |  | 13.00% | 13.00% | 13.40%
Series C preferred stock and warrants |  |  |  |
Equity Investment |  |  |  |
Payments to acquire equity securities | $ 15.0 |  |  |
Transaction costs to acquire equity securities | $ 0.8 |  |  |
Unrealized loss from fair value changes in equity investments |  | $ 0.3 | $ 0.7 |
Series C preferred stock |  |  |  |
Equity Investment |  |  |  |
Number of shares purchased under the securities purchase agreement | shares | 20,469,432 |  |  |
Equity and long-term investments at fair value |  | 15.8 | 15.8 | $ 15.8
Impairment of equity investments |  |  | 0.0 | 0.0
Warrants |  |  |  |
Equity Investment |  |  |  |
Number of warrants purchased under the securities purchase agreement | shares | 5,117,358 |  |  |
Equity and long-term investments at fair value |  | $ 0.4 | $ 0.4 | $ 1.1
Exercise price of warrants | $ / shares | $ 0.7328 |  |  |
Term of warrants | 1 year |  |  |

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