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Intangible Assets, Net - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Finite Lived Intangible Assets [Line Items]        
Amortization expenses $ 617 $ 417 $ 1,171 $ 790
Internally-developed Software        
Finite Lived Intangible Assets [Line Items]        
Intangible assets that have not started amortization 3,515   3,515  
Capitalized costs of internally-developed software $ 1,651 $ 1,518 $ 3,231 $ 3,069