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FAIR VALUE MEASUREMENTS (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, 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 |  | $ | 17,915 |  |  | $ | — |  |  | $ | — |  |  | $ | 17,915 |
Restricted cash: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificate of deposit |  | $ | 270 |  |  | $ | — |  |  | $ | — |  |  | $ | 270 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government-sponsored enterprise securities (due in one to two years) |  | $ | 10,008 |  |  | $ | 2 |  |  | $ | (15 | ) |  | $ | 9,995 |
Commercial paper (due in less than one year) |  |  | 35,695 |  |  |  | 58 |  |  |  | — |  |  |  | 35,753 |
Corporate notes (due in less than one year) |  |  | 81,928 |  |  |  | 184 |  |  |  | (5 | ) |  |  | 82,107 |
Corporate notes (due in one to two years) |  |  | 10,394 |  |  |  | 18 |  |  |  | (3 | ) |  |  | 10,409 |
|  | $ | 138,025 |  |  | $ | 262 |  |  | $ | (23 | ) |  | $ | 138,264 |
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 September 30, 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 September 30, 2019: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government-sponsored enterprise securities (due in one to two years) |  | $ | 8,484 |  |  | $ | (15 | ) |  | $ | — |  |  | $ | — |  |  | $ | 8,484 |  |  | $ | (15 | )
Corporate notes (due in less than one year) |  |  | 9,256 |  |  |  | (5 | ) |  |  | — |  |  |  | — |  |  |  | 9,256 |  |  |  | (5 | )
Corporate notes (due in one to two years) |  |  | 3,009 |  |  |  | (3 | ) |  |  | — |  |  |  | — |  |  |  | 3,009 |  |  |  | (3 | )
|  | $ | 20,749 |  |  | $ | (23 | ) |  | $ | — |  |  | $ | — |  |  | $ | 20,749 |  |  | $ | (23 | )
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 September 30, 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 September 30, 2019: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds(1) |  | $ | 17,915 |  |  | $ | — |  |  | $ | — |  |  | $ | 17,915 |
Government-sponsored enterprise securities (3) |  |  | — |  |  |  | 9,995 |  |  |  | — |  |  |  | 9,995 |
Commercial paper(2) |  |  | — |  |  |  | 35,753 |  |  |  | — |  |  |  | 35,753 |
Corporate notes(2)(3) |  |  | — |  |  |  | 92,516 |  |  |  | — |  |  |  | 92,516 |
Equity investment(4) |  |  | — |  |  |  | 373 |  |  |  | — |  |  |  | 373 |
Total |  | $ | 17,915 |  |  | $ | 138,637 |  |  | $ | — |  |  | $ | 156,552 |
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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