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FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Schedule of cash equivalents, restricted cash and marketable securities by security type | Cash equivalents, restricted cash and marketable securities by security type at December 31, 2017 were as follows:
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
(In thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
Included in cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 11,030 |  |  | $ | — |  |  | $ | — |  |  | $ | 11,030 |
Commercial paper |  |  | 2,242 |  |  |  | — |  |  |  | — |  |  |  | 2,242 |
Corporate notes |  |  | 1,750 |  |  |  | — |  |  |  | (1 | ) |  |  | 1,749 |
|  | $ | 15,022 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 15,021 |
Restricted cash: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificate of deposit |  | $ | 268 |  |  | $ | — |  |  | $ | — |  |  | $ | 268 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government-sponsored enterprise securities (due in less than one year) |  | $ | 12,500 |  |  | $ | — |  |  | $ | (40 | ) |  | $ | 12,460 |
Commercial paper (due in less than one year) |  |  | 10,928 |  |  |  | 4 |  |  |  | (1 | ) |  |  | 10,931 |
Corporate notes (due in less than one year) |  |  | 55,067 |  |  |  | — |  |  |  | (107 | ) |  |  | 54,960 |
Corporate notes (due in one to two years) |  |  | 14,303 |  |  |  | — |  |  |  | (62 | ) |  |  | 14,241 |
|  | $ | 92,798 |  |  | $ | 4 |  |  | $ | (210 | ) |  | $ | 92,592 |
Cash equivalents, restricted cash and marketable securities by security type at December 31, 2016 were as follows:
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
(In thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
Included in cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 11,193 |  |  | $ | — |  |  | $ | — |  |  | $ | 11,193 |
Restricted cash: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificate of deposit |  | $ | 268 |  |  | $ | — |  |  | $ | — |  |  | $ | 268 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government-sponsored enterprise securities (due in less than one year) |  | $ | 5,000 |  |  | $ | — |  |  | $ | (3 | ) |  | $ | 4,997 |
Government-sponsored enterprise securities (due in one to two years) |  |  | 12,500 |  |  |  | — |  |  |  | (42 | ) |  |  | 12,458 |
Commercial paper (due in less than one year) |  |  | 31,024 |  |  |  | 50 |  |  |  | (5 | ) |  |  | 31,069 |
Corporate notes (due in less than one year) |  |  | 66,012 |  |  |  | 4 |  |  |  | (47 | ) |  |  | 65,969 |
Corporate notes (due in one to two years) |  |  | 1,506 |  |  |  | — |  |  |  | (10 | ) |  |  | 1,496 |
|  | $ | 116,042 |  |  | $ | 54 |  |  | $ | (107 | ) |  | $ | 115,989 |
Schedule of cash equivalents and marketable securities with unrealized losses | 2. FAIR VALUE MEASUREMENTS (Continued) Cash equivalents and marketable securities with unrealized losses at December 31, 2017 and 2016 were as follows:
|  | Less Than 12 Months |  |  | 12 Months or Greater |  |  | Total |
|  |  |  |  |  | Gross |  |  |  |  |  |  | Gross |  |  |  |  |  |  | Gross |
|  | Estimated |  |  | Unrealized |  |  | Estimated |  |  | Unrealized |  |  | Estimated |  |  | Unrealized |
(In thousands) |  | Fair Value |  |  | Losses |  |  | Fair Value |  |  | Losses |  |  | Fair Value |  |  | Losses |
As of December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government-sponsored enterprise securities (due in less than one year) |  | $ | — |  |  | $ | — |  |  | $ | 12,460 |  |  | $ | (40 | ) |  | $ | 12,460 |  |  | $ | (40 | )
Commercial paper (due in less than one year) |  |  | 7,717 |  |  |  | (1 | ) |  |  | — |  |  |  | — |  |  |  | 7,717 |  |  |  | (1 | )
Corporate notes (due in less than one year) |  |  | 55,210 |  |  |  | (106 | ) |  |  | 1,499 |  |  |  | (2 | ) |  |  | 56,709 |  |  |  | (108 | )
Corporate notes (due in one to two years) |  |  | 14,241 |  |  |  | (62 | ) |  |  | — |  |  |  | — |  |  |  | 14,241 |  |  |  | (62 | )
|  | $ | 77,168 |  |  | $ | (169 | ) |  | $ | 13,959 |  |  | $ | (42 | ) |  | $ | 91,127 |  |  | $ | (211 | )
As of December 31, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government-sponsored enterprise securities (due in less than one year) |  | $ | 4,997 |  |  | $ | (3 | ) |  | $ | — |  |  | $ | — |  |  | $ | 4,997 |  |  | $ | (3 | )
Government-sponsored enterprise securities (due in one to two years) |  |  | 12,458 |  |  |  | (42 | ) |  |  | — |  |  |  | — |  |  |  | 12,458 |  |  |  | (42 | )
Commercial paper (due in less than one year) |  |  | 8,365 |  |  |  | (5 | ) |  |  | — |  |  |  | — |  |  |  | 8,365 |  |  |  | (5 | )
Corporate notes (due in less than one year) |  |  | 39,218 |  |  |  | (37 | ) |  |  | 6,944 |  |  |  | (10 | ) |  |  | 46,162 |  |  |  | (47 | )
Corporate notes (due in one to two years) |  |  | 1,496 |  |  |  | (10 | ) |  |  | — |  |  |  | — |  |  |  | 1,496 |  |  |  | (10 | )
|  | $ | 66,534 |  |  | $ | (97 | ) |  | $ | 6,944 |  |  | $ | (10 | ) |  | $ | 73,478 |  |  | $ | (107 | )
Schedule of financial instruments measured at fair value on recurring basis | The following table presents information about our financial instruments that are measured at fair value on a recurring basis as of December 31, 2017 and 2016 and indicates the fair value category assigned.
|  | Fair Value Measurements at Reporting Date Using |
|  | Quoted Prices in |  |  |  |  |  |  | Significant |  |  |  |  |
|  | Active Markets for |  |  | Significant Other |  |  | Unobservable |  |  |  |  |
|  | Identical Assets |  |  | Observable Inputs |  |  | Inputs |  |  |  |  |
(In thousands) |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
As of December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds(1) |  | $ | 11,030 |  |  | $ | — |  |  | $ | — |  |  | $ | 11,030 |
Government-sponsored enterprise securities(2) |  |  | — |  |  |  | 12,460 |  |  |  | — |  |  |  | 12,460 |
Commercial paper(1)(2) |  |  | — |  |  |  | 13,173 |  |  |  | — |  |  |  | 13,173 |
Corporate notes(1)(2)(3) |  |  | — |  |  |  | 70,950 |  |  |  | — |  |  |  | 70,950 |
Total |  | $ | 11,030 |  |  | $ | 96,583 |  |  | $ | — |  |  | $ | 107,613 |
As of December 31, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds(1) |  | $ | 11,193 |  |  | $ | — |  |  | $ | — |  |  | $ | 11,193 |
Government-sponsored enterprise securities(2)(3) |  |  | — |  |  |  | 17,455 |  |  |  | — |  |  |  | 17,455 |
Commercial paper(2) |  |  | — |  |  |  | 31,069 |  |  |  | — |  |  |  | 31,069 |
Corporate notes(2)(3) |  |  | — |  |  |  | 67,465 |  |  |  | — |  |  |  | 67,465 |
Total |  | $ | 11,193 |  |  | $ | 115,989 |  |  | $ | — |  |  | $ | 127,182 |
(1) | Included in cash and cash equivalents on our balance sheets.
(2) | Included in current portion of marketable securities on our balance sheets.
(3) | Included in noncurrent portion of marketable securities on our balance sheets.

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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