Quarterly report pursuant to Section 13 or 15(d)

BALANCE SHEET DETAILS - Accrued Expenses (Details)

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BALANCE SHEET DETAILS - Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Condensed Balance Sheet Statements, Captions [Line Items]    
Accrued payroll expenses $ 8,616 $ 8,324
Other accrued liabilities 2,186 1,481
Total accrued expenses 10,802 9,805
Accrued Expenses | Former President and CEO    
Condensed Balance Sheet Statements, Captions [Line Items]    
Payroll taxes payable $ 6,200 $ 6,200