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Revenue Recognition - Contract Balances with Contract Customers (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts receivable, net | $ 0 | $ 1,079
Accrued liabilities | 0 | 432
Deferred revenue | 0 | 21
Contract liabilities | 7,765 | 9,755
Other current liabilities | 0 | 83
Other current assets | 698 | 729
Contracts with Customers |  |
Accounts receivable, net | 0 | 1,079
Accrued liabilities | 0 | 432
Deferred revenue | 0 | 21
Contract liabilities | $ 7,765 | $ 9,755

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