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STOCK-BASED COMPENSATION - Employee Stock Purchase Plan - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Jun. 25, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Proceeds from common stock issued |  |  | $ 684,000 |  |
Employee Stock Purchase Plan (ESPP) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [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) |  |  | 7,861 | 6,808 |
Proceeds from common stock issued |  |  | $ 529,000 | $ 318,000 |
Employee Stock Purchase Plan (ESPP) [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Charges to expense | $ 20,000 | $ 10,000 | 56,000 | 31,000 |
Employee Stock Purchase Plan (ESPP) [Member] | Research and Development Expense [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Charges to expense | 21,000 | 17,000 | 68,000 | 51,000 |
Employee Stock Purchase Plan (ESPP) [Member] | Cost of Material Sales [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Charges to expense | $ 13,000 | $ 4,000 | $ 31,000 | $ 12,000 |

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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 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 Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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