Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition - Additional Information (Details)

v3.21.2
Revenue Recognition - Additional Information (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Jan. 01, 2021
Dec. 31, 2020
Disaggregation Of Revenue [Line Items]      
Allowances for product returns $ 300    
Estimated life of particular model phone 4 years    
Contract liabilities $ 0 $ 5 $ 5
Other Assets      
Disaggregation Of Revenue [Line Items]      
Total capitalized costs $ 2,684   $ 2,889