PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment balances (Details) - USD ($) $ in Thousands	3 Months Ended
Jun. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Total	$ 54,504	$ 52,505
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	32,646	30,547
Property, plant and equipment, net	21,858	21,958
Leasehold improvement
Property, Plant and Equipment [Line Items]
Total	$ 6,020	4,830
Leasehold improvement \| Minimum
Property, Plant and Equipment [Line Items]
Useful Lives (in years)	1 year
Leasehold improvement \| Maximum
Property, Plant and Equipment [Line Items]
Useful Lives (in years)	20 years
Machinery and production equipment
Property, Plant and Equipment [Line Items]
Total	$ 6,530	6,404
Machinery and production equipment \| Minimum
Property, Plant and Equipment [Line Items]
Useful Lives (in years)	3 years
Machinery and production equipment \| Maximum
Property, Plant and Equipment [Line Items]
Useful Lives (in years)	10 years
Spinal hardware instrument sets
Property, Plant and Equipment [Line Items]
Total	$ 25,450	25,080
Spinal hardware instrument sets \| Minimum
Property, Plant and Equipment [Line Items]
Useful Lives (in years)	5 years
Spinal hardware instrument sets \| Maximum
Property, Plant and Equipment [Line Items]
Useful Lives (in years)	5 years
Information systems and hardware
Property, Plant and Equipment [Line Items]
Total	$ 6,972	6,872
Information systems and hardware \| Minimum
Property, Plant and Equipment [Line Items]
Useful Lives (in years)	3 years
Information systems and hardware \| Maximum
Property, Plant and Equipment [Line Items]
Useful Lives (in years)	7 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total	$ 1,194	944
Furniture and fixtures \| Minimum
Property, Plant and Equipment [Line Items]
Useful Lives (in years)	3 years
Furniture and fixtures \| Maximum
Property, Plant and Equipment [Line Items]
Useful Lives (in years)	5 years
Construction in progress
Property, Plant and Equipment [Line Items]
Total	$ 8,338	$ 8,375

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.14)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.13)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.13)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 13
-Subparagraph a
-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 8
-Article 7

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

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