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Prepaid Expenses And Other Current Assets
 6 Months Ended
Jun. 30, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Prepaid Expenses And Other Current Assets PREPAID EXPENSES AND OTHER CURRENT ASSETS
Prepaid expenses and other current assets consisted of the following as of June 30, 2021 and December 31, 2020:
 June 30, 2021December 31, 2020
(in thousands)
Accrued interest on short-term available-for-sale securities$1,224 $612 
Prepaid equipment service contracts379 383 
Prepaid external research and development and outside services3,693 1,889 
Prepaid software641 736 
Prepaid insurance1,025 2,881 
Prepaid rent and other464 240 
Total prepaid expenses and other current assets$7,426 $6,741