SEGMENTS INFORMATION - Geographical Information of Long-Lived Assets Based on Physical Location (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 70,284	$ 60,499
Belarus
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	44,942	44,879
Ukraine
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	5,735	4,487
Russia
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	4,851	2,084
Hungary
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	3,945	2,485
United States
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	2,685	1,969
Poland
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	2,135	1,088
China
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	1,715	514
India
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	1,594	1,099
Other
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 2,682	$ 1,894