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Summary of Significant Accounting Policies Recently Adopted Accounting Pronouncements 2016-02 (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Jan. 01, 2018
--- | --- | --- | --- | --- | ---
Assets |  |  |  |  |
Prepaid expenses and other current assets | $ 20,777 | $ 15,540 | $ 11,458 | $ 11,775 | $ 5,694
Operating lease right-of-use assets | 30,561 | 27,803 | 16,945 | 0 |
Liabilities and Stockholders’ Equity |  |  |  |  |
Other current liabilities | 4,451 | 11,139 | 4,940 | 1,447 |
Operating lease liabilities | $ 41,991 | $ 36,138 | 20,056 | 0 |
Other long-term liabilities |  |  | 159 | $ 7,080 |
Accounting Standards Update 2016-02 |  |  |  |  |
Assets |  |  |  |  |
Prepaid expenses and other current assets |  |  | (317) |  |
Operating lease right-of-use assets |  |  | 16,945 |  |
Liabilities and Stockholders’ Equity |  |  |  |  |
Other current liabilities |  |  | 3,493 |  |
Operating lease liabilities |  |  | 20,056 |  |
Other long-term liabilities |  |  | $ (6,921) |  |

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