Segment reporting and concentrations (Details 1) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Long - lived assets	$ 16,322	$ 10,186
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long - lived assets	4,669	1,104
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long - lived assets	5,085	5,223
India [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long - lived assets	1,520	1,611
Philippines [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long - lived assets	1,940	1,580
Sri Lanka [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long - lived assets	683	635
Israel [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long - lived assets	47	31
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long - lived assets	2	2
Foreign Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long - lived assets	11,653	9,082
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Long - lived assets	$ 2,376	$ 0