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BALANCE SHEETS DETAILS Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid Expense $ 882 $ 816
Contract with Customer, Asset, after Allowance for Credit Loss, Current 10,821 11,623
Other Assets, Current 239 171
Prepaid expenses and other current assets $ 11,942 $ 12,610