SEGMENTS INFORMATION - Geographical Information of Long-Lived Assets Based on Physical Location (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 66,751	$ 60,499
Belarus
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	44,399	44,879
Ukraine
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	5,717	4,487
Russia
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	3,604	2,084
Hungary
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	3,345	2,485
United States
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	2,456	1,969
Poland
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	1,827	1,088
India
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	1,540	1,099
China
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	1,504	514
Other
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 2,359	$ 1,894