XML 157 R85.htm IDEA: XBRL DOCUMENT v3.20.1
Property and equipment - Summary of Depreciation Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]      
Depreciation expense $ 5,824 $ 5,595 $ 7,948
Cost of Revenue [Member]      
Property, Plant and Equipment [Line Items]      
Depreciation expense 5,198 5,018 7,647
General and administrative expenses [Member]      
Property, Plant and Equipment [Line Items]      
Depreciation expense 317 245 277
Sales and marketing expenses [Member]      
Property, Plant and Equipment [Line Items]      
Depreciation expense 9 1  
Research and development expenses [Member]      
Property, Plant and Equipment [Line Items]      
Depreciation expense $ 300 $ 331 $ 24