Annual report pursuant to Section 13 and 15(d)

Disaggregated Revenues - Summary of Disaggregated Revenues By Geography (Details)

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Disaggregated Revenues - Summary of Disaggregated Revenues By Geography (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
Asia                      
Disaggregation Of Revenue [Line Items]                      
Disaggregated revenues                 40,810 45,235 33,165
North America                      
Disaggregation Of Revenue [Line Items]                      
Disaggregated revenues                 11,611 9,979 8,775
Other                      
Disaggregation Of Revenue [Line Items]                      
Disaggregated revenues                 $ 3,318 $ 5,412 $ 7,581