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CONCENTRATION OF RISK - Additional Information (Details)

3 Months Ended

12 Months Ended

Dec. 31, 2016

USD ($)

^[1]

Sep. 30, 2016

USD ($)

Jun. 30, 2016

USD ($)

^[1]

Mar. 31, 2016

USD ($)

Dec. 31, 2015

USD ($)

^[1]

Sep. 30, 2015

USD ($)

Jun. 30, 2015

USD ($)

^[1],[2]

Mar. 31, 2015

USD ($)

Dec. 31, 2016

USD ($)

supplier

Dec. 31, 2015

USD ($)

Dec. 31, 2014

USD ($)

Concentration Risk [Line Items]

Revenue

$ 74,577,000

$ 30,214,000

$ 64,392,000

$ 29,703,000

$ 62,312,000

$ 39,419,000

$ 58,092,000

$ 31,223,000

$ 198,886,000

$ 191,046,000

$ 191,031,000

Supplier Concentration Risk [Member]

Concentration Risk [Line Items]

Number of suppliers from which chemical materials were purchased | supplier

1

Total Revenue [Member] | Government Contracts Concentration Risk [Member]

Concentration Risk [Line Items]

Revenue

$ 156,000

$ 185,000

$ 118,000

Concentration risk, percentage (less than 1% for contracts with U.S. government agencies)

1.00%

1.00%

1.00%

Total Revenue [Member] | Customer Concentration Risk [Member] | Excluding North America [Member]

Concentration Risk [Line Items]

Concentration risk, percentage (less than 1% for contracts with U.S. government agencies)

98.00%

99.00%

99.00%

[1]	The Company receives significant license revenue in the second and fourth quarters; see Note 2 for further details.
[2]	Includes a $33.0 million write down of inventory

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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