FAIR VALUE MEASUREMENTS - Unobservable Inputs (Level 3) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Fair Value Measurements Using Unobservable Inputs (Level 3)
Contingent consideration attributable to and assumed from ABILITY Acquisition	$ (67)	$ (9,364)
Level 3
Fair Value Measurements Using Unobservable Inputs (Level 3)
Balance, beginning of period	(31,824)	$ (7,400)	$ (7,400)
Fair value adjustment	449		(6,159)
Accretion expense (recognized in general and administrative expenses)	(516)		(1,053)
Settlement of liability	15,149		0
Total	(16,742)		(31,824)
Level 3 \| General and administrative
Fair Value Measurements Using Unobservable Inputs (Level 3)
Fair value adjustment	700		5,600
Level 3 \| Goodwill
Fair Value Measurements Using Unobservable Inputs (Level 3)
Fair value adjustment	(300)		600
Contingent Consideration Attributable to Acquisition \| Level 3
Fair Value Measurements Using Unobservable Inputs (Level 3)
Contingent consideration attributable to and assumed from ABILITY Acquisition	$ 0		$ (17,212)

Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Fair Value Adjustment

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- Definition

Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
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- Definition

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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