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Income Taxes - Summary of Income (Loss) Before Income Taxes and Equity Loss in Investee (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
Income Tax Disclosure [Abstract]                    
U.S. income (loss) before income taxes and equity loss in investee                 $ 679 $ (4,602)
Foreign income (loss) before income taxes and equity loss in investee                 (270) (34)
Income (loss) before income taxes and equity loss in investee $ (160) $ 1,698 $ 487 $ (1,616) $ (931) $ (703) $ (903) $ (2,099) $ 409 $ (4,636)