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FAIR VALUE MEASUREMENTS (Tables) | 3 Months Ended
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Mar. 31, 2019
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 March 31, 2019 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 |  | $ | 4,750 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,750 |
Restricted cash: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificate of deposit |  | $ | 270 |  |  | $ | — |  |  | $ | — |  |  | $ | 270 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper (due in less than one year) |  | $ | 56,474 |  |  | $ | 45 |  |  | $ | (19 | ) |  | $ | 56,500 |
Corporate notes (due in less than one year) |  |  | 88,648 |  |  |  | 45 |  |  |  | (13 | ) |  |  | 88,680 |
Corporate notes (due in one to two years) |  |  | 17,830 |  |  |  | 46 |  |  |  | (5 | ) |  |  | 17,871 |
|  | $ | 162,952 |  |  | $ | 136 |  |  | $ | (37 | ) |  | $ | 163,051 |
Cash equivalents, restricted cash and marketable securities by security type at December 31, 2018 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 |  | $ | 7,003 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,003 |
Restricted cash: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificate of deposit |  | $ | 269 |  |  | $ | — |  |  | $ | — |  |  | $ | 269 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper (due in less than one year) |  | $ | 57,594 |  |  | $ | 22 |  |  | $ | (29 | ) |  | $ | 57,587 |
Corporate notes (due in less than one year) |  |  | 95,238 |  |  |  | 7 |  |  |  | (118 | ) |  |  | 95,127 |
Corporate notes (due in one to two years) |  |  | 18,647 |  |  |  | — |  |  |  | (65 | ) |  |  | 18,582 |
|  | $ | 171,479 |  |  | $ | 29 |  |  | $ | (212 | ) |  | $ | 171,296 |
Schedule of cash equivalents and marketable securities with unrealized losses | Cash equivalents and marketable securities with unrealized losses that have been in a continuous unrealized loss position for less than 12 months and 12 months or longer at March 31, 2019 and December 31, 2018 were as follows:
|  | Less Than 12 Months |  |  | 12 Months or Longer |  |  | Total |
|  |  |  |  |  | Gross |  |  |  |  |  |  | Gross |  |  |  |  |  |  | Gross |
|  | Estimated |  |  | Unrealized |  |  | Estimated |  |  | Unrealized |  |  | Estimated |  |  | Unrealized |
(In thousands) |  | Fair Value |  |  | Losses |  |  | Fair Value |  |  | Losses |  |  | Fair Value |  |  | Losses |
As of March 31, 2019: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper (due in less than one year) |  | $ | 15,792 |  |  | $ | (19 | ) |  | $ | — |  |  | $ | — |  |  | $ | 15,792 |  |  | $ | (19 | )
Corporate notes (due in less than one year) |  |  | 27,115 |  |  |  | (5 | ) |  |  | 13,226 |  |  |  | (8 | ) |  |  | 40,341 |  |  |  | (13 | )
Corporate notes (due in one to two years) |  |  | 1,999 |  |  |  | (5 | ) |  |  | — |  |  |  | — |  |  |  | 1,999 |  |  |  | (5 | )
|  | $ | 44,906 |  |  | $ | (29 | ) |  | $ | 13,226 |  |  | $ | (8 | ) |  | $ | 58,132 |  |  | $ | (37 | )
As of December 31, 2018: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper (due in less than one year) |  | $ | 22,628 |  |  | $ | (29 | ) |  | $ | — |  |  | $ | — |  |  | $ | 22,628 |  |  |  | (29 | )
Corporate notes (due in less than one year) |  |  | 66,557 |  |  |  | (82 | ) |  |  | 14,221 |  |  |  | (36 | ) |  |  | 80,778 |  |  |  | (118 | )
Corporate notes (due in one to two years) |  |  | 18,582 |  |  |  | (65 | ) |  |  | — |  |  |  | — |  |  |  | 18,582 |  |  |  | (65 | )
|  | $ | 107,767 |  |  | $ | (176 | ) |  | $ | 14,221 |  |  | $ | (36 | ) |  | $ | 121,988 |  |  | $ | (212 | )
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 March 31, 2019 and December 31, 2018 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 March 31, 2019: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds(1) |  | $ | 4,750 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,750 |
Commercial paper(2) |  |  | — |  |  |  | 56,500 |  |  |  | — |  |  |  | 56,500 |
Corporate notes(2)(3) |  |  | — |  |  |  | 106,551 |  |  |  | — |  |  |  | 106,551 |
Equity investment(4) |  |  | — |  |  |  | 688 |  |  |  | — |  |  |  | 688 |
Total |  | $ | 4,750 |  |  | $ | 163,739 |  |  | $ | — |  |  | $ | 168,489 |
As of December 31, 2018: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds(1) |  | $ | 7,003 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,003 |
Commercial paper(2) |  |  | — |  |  |  | 57,587 |  |  |  | — |  |  |  | 57,587 |
Corporate notes(2)(3) |  |  | — |  |  |  | 113,709 |  |  |  | — |  |  |  | 113,709 |
Equity investment(4) |  |  | — |  |  |  | 585 |  |  |  | — |  |  |  | 585 |
Total |  | $ | 7,003 |  |  | $ | 171,881 |  |  | $ | — |  |  | $ | 178,884 |
(1) | Included in cash and cash equivalents on our condensed balance sheets.
(2) | Included in current portion of marketable securities on our condensed balance sheets.
(3) | Included in noncurrent portion of marketable securities on our condensed balance sheets.
(4) | Included in other assets on our condensed balance sheets. See further discussion below of this equity investment.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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