Balance Sheet Information - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Balance Sheet Information
Accrued selling, general and administrative expenses	$ 2,715	$ 1,189
Accrued salaries and bonuses	862	1,596
Accrued employees benefits	161	0
Accrued restructuring and acquisition related costs	0	1,885
Accrued cost of revenues	2,036	813
Accrued taxes (including VAT)	3,010	1,834
Accrued interest payable	53	68
Other accrued expenses	765	356
Accrued expenses and other payables	$ 9,602	$ 7,741