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STOCK-BASED COMPENSATION, Equity Instruments Other Than Options - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Fair value of shares withheld for tax withholding obligations |  |  | $ 4,794,000 |
Restricted Stock [Member] |  |  |  |
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Grants in period (shares) |  |  | 41,543 |
Total fair value of performance unit awards granted |  |  | $ 2,100,000 |
Shares withheld for tax withholding obligations (in shares) |  |  | 82,780 | 97,856
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 | $ 1,600,000 | $ 1,600,000 | 3,300,000 | 2,500,000
Restricted Stock [Member] | Research and Development Expense [Member] |  |  |  |
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Compensation expense | 403,000 | 495,000 | 975,000 | 892,000
Restricted Stock [Member] | Cost of Material Sales [Member] |  |  |  |
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Compensation expense | 94,000 | 0 | $ 258,000 | 0
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 | 121,000 | 85,000 | $ 164,000 | $ 274,000
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 | 278,000 | 175,000 | $ 555,000 | 504,000
Performance Shares [Member] | Research and Development Expense [Member] |  |  |  |
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Compensation expense | 77,000 | 45,000 | 154,000 | 142,000
Performance Shares [Member] | Cost of Material Sales [Member] |  |  |  |
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Compensation expense | $ 28,000 | $ 0 | $ 57,000 | $ 0

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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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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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