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Significant Accounting Policies, Basic and Diluted Net Loss per Share (Details) - $ / shares | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Basic and Diluted Net Loss per Share [Abstract] |  |  |  |  |
Basic net loss per share (in dollars per share) | $ (0.74) | $ (0.57) | $ (1.20) | $ (1.21) |
0 Percent Convertible Senior Notes [Member] |  |  |  |  |
Basic and Diluted Net Loss per Share [Abstract] |  |  |  |  |
Interest rate on convertible senior notes | 0.00% | 0.00% | 0.00% | 0.00% | 0.00%
0.125 Percent Convertible Senior Notes [Member] |  |  |  |  |
Basic and Diluted Net Loss per Share [Abstract] |  |  |  |  |
Interest rate on convertible senior notes | 0.125% | 0.125% | 0.125% | 0.125% | 0.125%
1 Percent Convertible Senior Notes [Member] |  |  |  |  |
Basic and Diluted Net Loss per Share [Abstract] |  |  |  |  |
Interest rate on convertible senior notes | 1.00% | 1.00% | 1.00% | 1.00% |

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