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Intangible Assets, Net - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Finite Lived Intangible Assets [Line Items]    
Amortization expenses $ 554 $ 373
Internally-developed Software    
Finite Lived Intangible Assets [Line Items]    
Intangible assets that have not started amortization 4,083  
Capitalized costs of internally-developed software $ 1,580 $ 1,551