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Balance Sheet Accounts - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Performance bonus $ 1,672 $ 2,080
Payroll and related expenses 3,235 1,996
Bonus feature of stock option grants 5,380 4,212
Commissions 465 522
Professional and legal services 456 500
Short-term minimum lease payments under capital leases 53 258
Warranty reserve 275 313
Advisory board and board of director related expenses 80 124
Other 476 672
Accrued liabilities $ 12,092 $ 10,677