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STOCK-BASED COMPENSATION, Employee Stock Purchase Plan - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 25, 2009
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |
Proceeds from common stock issued |  |  | $ 264,000 |  |
Employee Stock Purchase Plan (ESPP) [Member] |  |  |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |
Reserved for issuance (in shares) |  |  |  |  | 1,000,000
Purchase period (in months) |  |  | 3 months |  |
Percentage of market value (in hundredths) |  |  | 85.00% |  |
Maximum allocation of base compensation (in hundredths) |  |  | 10.00% |  |
Maximum shares per purchase date (in shares) |  |  | 12,500 |  |
Maximum value per calendar year, per employee |  |  | $ 25,000 |  |
Common stock issued (in shares) |  |  | 4,331 | 5,819 |
Proceeds from common stock issued |  |  | $ 201,000 | $ 171,000 |
Employee Stock Purchase Plan (ESPP) [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |
Charges to expense | $ 10,000 | $ 10,000 | 20,000 | 21,000 |
Employee Stock Purchase Plan (ESPP) [Member] | Research and Development Expense [Member] |  |  |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |
Charges to expense | 18,000 | 13,000 | 35,000 | 26,000 |
Employee Stock Purchase Plan (ESPP) [Member] | Cost of Material Sales [Member] |  |  |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |
Charges to expense | $ 4,000 | $ 0 | $ 8,000 | $ 0 |

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- Definition The maximum percentage of employees' base compensation that can be allocated under the plan. + References No definition available. + Details
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- Definition The maximum number of shares that may be purchased on a given purchase date, under the plan. + References No definition available. + Details
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- Definition The maximum value of shares that may be purchased by a single employee during a given calendar year, under the plan. + References No definition available. + Details
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- Definition The percentage of the lesser of the price per share of common stock on the first day of the purchase period, or the last day of the purchase period, at which eligible employees may purchase shares under the plan. + References No definition available. + Details
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- Definition The duration (in consecutive months) of purchase periods as defined by the the plan. + References No definition available. + Details
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- Definition The amount of plan compensation cost recognized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929 + Details
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- Definition Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929 + Details
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