FIXED ASSETS (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
FIXED ASSETS
Total	$ 80,746,000us-gaap_PropertyPlantAndEquipmentGross	$ 60,758,000us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation	(20,114,000)	(12,576,000)
Fixed assets, net	60,632,000us-gaap_PropertyPlantAndEquipmentNet	48,182,000us-gaap_PropertyPlantAndEquipmentNet
Depreciation expense	9,300,000us-gaap_Depreciation	3,700,000us-gaap_Depreciation	3,600,000us-gaap_Depreciation
Capitalized interest	400,000us-gaap_InterestCostsCapitalized	1,100,000us-gaap_InterestCostsCapitalized	2,000,000us-gaap_InterestCostsCapitalized
Manufacturing and laboratory equipment
FIXED ASSETS
Total	29,697,000	19,570,000
Computer equipment and software
FIXED ASSETS
Total	3,754,000	2,476,000
Office furniture and equipment
FIXED ASSETS
Total	1,001,000	441,000
Leasehold improvements
FIXED ASSETS
Total	26,350,000	24,852,000
Construction in progress
FIXED ASSETS
Total	$ 19,944,000	$ 13,419,000

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

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-Name Regulation S-X (SX)

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Amount of interest capitalized during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Allowance for Funds Used during Construction

-URI http://asc.fasb.org/extlink&oid=6504829

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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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

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