FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Nov. 30, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value of contingent purchase consideration	$ 5,502	$ 5,464
Fair value, measurements, recurring | Contingent Purchase Consideration
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deal related compensation expense, accretion charges and changes related to settlements of contractual non-compliance liabilities	38
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value of contingent purchase consideration	5,502	5,464
Simena
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value of contingent purchase consideration				$ 8,000
Simena | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value of contingent purchase consideration	$ 5,000	4,900
Efflux
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value of contingent purchase consideration		$ 523
Efflux | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value of contingent purchase consideration			$ 523