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Restricted Cash
6 Months Ended
Jun. 30, 2021
Restricted Cash And Cash Equivalents [Abstract]  
Restricted Cash

6. Restricted cash

As of June 30, 2021 and December 31, 2020, the Company maintained standby letters of credit of $2.1 million, which are collateralized with a bank account at a financial institution in accordance with the applicable lease agreements.