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Intangible assets, net - Schedule of Amortization Expense Recognized (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]      
Amortization expense $ 1,200 $ 1,231 $ 2,101
Cost of Revenue [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortization expense 5 266 241
General and administrative expenses [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortization expense 1,136 721 415
Research and development expenses [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortization expense $ 59 $ 244 $ 1,445