SEGMENT AND GEOGRAPHIC DATA Geographic Data Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenue	$ 118,108	$ 108,136	$ 335,104	$ 322,430
Long-lived assets, net of accumulated depreciation and amortization	8,155	9,248	8,155	9,248
Net assets	44,776	44,702	44,776	44,702	$ 41,885
United Kingdon
Segment Reporting Information [Line Items]
Revenue	24,265	27,010	73,751	93,671
Long-lived assets, net of accumulated depreciation and amortization	1,114	1,235	1,114	1,235
Net assets	9,025	11,962	9,025	11,962
Australia
Segment Reporting Information [Line Items]
Revenue	58,980	49,799	158,845	136,813
Long-lived assets, net of accumulated depreciation and amortization	3,712	4,457	3,712	4,457
Net assets	13,542	8,601	13,542	8,601
CHINA
Segment Reporting Information [Line Items]
Revenue	4,875	4,087	12,891	12,362
Long-lived assets, net of accumulated depreciation and amortization	2,355	2,523	2,355	2,523
Net assets	6,592	7,143	6,592	7,143
United States
Segment Reporting Information [Line Items]
Revenue	3,860	3,921	11,907	11,016
Long-lived assets, net of accumulated depreciation and amortization	130	445	130	445
Net assets	2,762	2,954	2,762	2,954
Europe
Segment Reporting Information [Line Items]
Revenue	13,290	12,356	43,351	39,382
Long-lived assets, net of accumulated depreciation and amortization	323	196	323	196
Net assets	9,176	8,777	9,176	8,777
Asia Pacific
Segment Reporting Information [Line Items]
Revenue	12,653	10,721	33,747	28,542
Long-lived assets, net of accumulated depreciation and amortization	521	384	521	384
Net assets	3,900	5,321	3,900	5,321
Other Americas
Segment Reporting Information [Line Items]
Revenue	185	242	612	644
Long-lived assets, net of accumulated depreciation and amortization	0	8	0	8
Net assets	$ (221)	$ (56)	$ (221)	$ (56)