Annual report pursuant to Section 13 and 15(d)

Disaggregated Revenues - Summary of Disaggregated Revenues By Sales Channel (Details)

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Disaggregated Revenues - Summary of Disaggregated Revenues By Sales Channel (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation Of Revenue [Line Items]                      
Disaggregated revenues $ 13,028 $ 13,142 $ 14,462 $ 15,107 $ 16,562 $ 15,787 $ 14,972 $ 13,305 $ 55,739 $ 60,625 $ 49,521
Fullfilment Distributors                      
Disaggregation Of Revenue [Line Items]                      
Disaggregated revenues                 32,273 34,389 21,802
OEM/ODM/CM                      
Disaggregation Of Revenue [Line Items]                      
Disaggregated revenues                 17,075 20,155 21,504
Other                      
Disaggregation Of Revenue [Line Items]                      
Disaggregated revenues                 $ 6,391 $ 6,081 $ 6,215