XML 86 R68.htm IDEA: XBRL DOCUMENT v3.20.4
Disaggregated Revenues - Summary of Disaggregated Revenues By Geography (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disaggregation Of Revenue [Line Items]    
Disaggregated revenues $ 48,502 $ 55,739
China    
Disaggregation Of Revenue [Line Items]    
Disaggregated revenues 35,173 40,810
North America    
Disaggregation Of Revenue [Line Items]    
Disaggregated revenues 10,044 11,611
Other    
Disaggregation Of Revenue [Line Items]    
Disaggregated revenues $ 3,285 $ 3,318