SEGMENT AND GEOGRAPHIC DATA Geographic Data Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenue	$ 113,591	$ 113,067	$ 216,996	$ 214,294
Long-lived assets, net of accumulated depreciation and amortization	8,436	9,365	8,436	9,365
Net assets	44,611	48,757	44,611	48,757	$ 41,885
United Kingdon
Segment Reporting Information [Line Items]
Revenue	24,317	32,464	49,485	66,661
Long-lived assets, net of accumulated depreciation and amortization	1,169	1,317	1,169	1,317
Net assets	9,839	14,221	9,839	14,221
Australia
Segment Reporting Information [Line Items]
Revenue	53,312	47,882	99,866	87,015
Long-lived assets, net of accumulated depreciation and amortization	3,870	4,268	3,870	4,268
Net assets	12,847	9,450	12,847	9,450
CHINA
Segment Reporting Information [Line Items]
Revenue	4,385	4,293	8,016	8,275
Long-lived assets, net of accumulated depreciation and amortization	2,350	2,600	2,350	2,600
Net assets	5,581	10,294	5,581	10,294
United States
Segment Reporting Information [Line Items]
Revenue	3,942	3,462	8,047	7,096
Long-lived assets, net of accumulated depreciation and amortization	209	544	209	544
Net assets	2,244	2,037	2,244	2,037
Europe
Segment Reporting Information [Line Items]
Revenue	15,849	14,903	30,062	27,025
Long-lived assets, net of accumulated depreciation and amortization	257	180	257	180
Net assets	9,911	8,987	9,911	8,987
Asia Pacific
Segment Reporting Information [Line Items]
Revenue	11,567	9,864	21,092	17,820
Long-lived assets, net of accumulated depreciation and amortization	581	456	581	456
Net assets	4,352	3,847	4,352	3,847
Other Americas
Segment Reporting Information [Line Items]
Revenue	219	199	428	402
Long-lived assets, net of accumulated depreciation and amortization	0	0	0	0
Net assets	$ (163)	$ (79)	$ (163)	$ (79)