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STOCK-BASED COMPENSATION, Equity Instruments Other Than Options - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Fair value of shares withheld for tax withholding obligations |  |  | $ 4,840,000 |
Restricted Stock [Member] |  |  |  |
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Grants in period (shares) |  |  | 137,720 |
Total fair value of performance unit awards granted |  |  | $ 8,500,000 |
Shares withheld for tax withholding obligations (in shares) |  |  | 83,553 | 98,635
Fair value of shares withheld for tax withholding obligations |  |  | $ 4,400,000 | $ 4,200,000
Restricted Stock [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Compensation expense | $ 1,900,000 | $ 1,900,000 | 5,300,000 | 4,400,000
Restricted Stock [Member] | Research and Development Expense [Member] |  |  |  |
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Compensation expense | 376,000 | 492,000 | 1,400,000 | 1,400,000
Restricted Stock [Member] | Cost of Material Sales [Member] |  |  |  |
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Compensation expense | 94,000 | 4,600 | $ 352,000 | 11,000
Restricted Stock [Member] | Minimum [Member] |  |  |  |
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Restricted stock awards and units vesting terms |  |  | 3 years |
Restricted Stock [Member] | Maximum [Member] |  |  |  |
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Restricted stock awards and units vesting terms |  |  | 5 years |
Restricted Stock Units (RSUs) [Member] | Research and Development Expense [Member] | Non Employee Members of Scientific Advisory Board [Member] |  |  |  |
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Compensation expense (credit) | 10,000 | (51,000) | $ 174,000 | $ 223,000
Performance Shares [Member] |  |  |  |
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Grants in period (shares) |  |  | 25,045 |
Total fair value of performance unit awards granted |  |  | $ 1,500,000 |
Shares withheld for tax withholding obligations (in shares) |  |  | 0 | 16,071
Fair value of shares withheld for tax withholding obligations |  |  | $ 0 | $ 752,000
Performance Shares [Member] | Performance-Based Vesting Requirement [Member] |  |  |  |
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Grants in period (shares) |  |  | 12,520 |
Performance Shares [Member] | Market-Based Vesting Requirement [Member] |  |  |  |
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Grants in period (shares) |  |  | 12,525 |
Performance Shares [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Compensation expense | 281,000 | 219,000 | $ 836,000 | 723,000
Performance Shares [Member] | Research and Development Expense [Member] |  |  |  |
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Compensation expense | 78,000 | 58,000 | 232,000 | 200,000
Performance Shares [Member] | Cost of Material Sales [Member] |  |  |  |
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Compensation expense | $ 29,000 | $ 0 | $ 85,000 | $ 0

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- Definition Share based compensation arrangement by share based payment award equity instruments other than options grants in period grant date fair value. + References No definition available. + Details
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- Definition The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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