Summary of Significant Accounting Policies - Fair Value Measurements of Financial Instruments (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
|
| Impairment of property and equipment | $ 1,656 | $ 1,656 | ||
| Property And Equipment [Member] | ||||
| Impairment of property and equipment | $ 1,700 | $ 0 | $ 1,700 | $ 0 |
| X | ||||||||||
- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Details
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