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Financial Instruments and Fair Value Measurements - Equity Investment in InCarda (Details) - InCarda | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2021 USD ($) Director | Sep. 30, 2020 USD ($) $ / shares shares | Sep. 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 |  | $ 15,000,000.0 |  |
Transaction costs to acquire equity securities |  | $ 800,000 |  |
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 | $ 15,800,000 |  | $ 15,800,000 | $ 15,800,000
Impairment of equity investments |  |  | 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 | $ 600,000 |  | 600,000 | $ 1,100,000
Exercise price of warrants | $ / shares |  | $ 0.7328 |  |
Extended expiration date | Mar. 31, 2022 |  |  |
Unrealized loss from fair value changes in equity investments |  |  | $ 600,000 |
Unrealized gain from fair value changes in equity investments | $ 100,000 |  |  |

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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=121548190&loc=d3e32787-111569 + Details
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