v3.8.0.1

FAIR VALUE DISCLOSURE (Tables) | 9 Months Ended
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Sep. 30, 2017
Fair Value Disclosures [Abstract] |
Schedule of financial assets and liabilities measured at fair value on a recurring basis | The components of the Company’s Level 1 and Level 2 assets are as follows:
| September 30, 2017
| Amortized Cost |  | Gross Unrealized Gain (Loss) |  | Estimated Fair Value |  | Cash equivalents |  | Short-term investments
| (in thousands)
Level 1: |  |  |  |  |  |  |  |  |
Money market funds | 9,911 |  |  | — |  |  | 9,911 |  |  | 9,911 |  |  | — |
| $ | 9,911 |  |  | $ | — |  |  | $ | 9,911 |  |  | $ | 9,911 |  |  | $ | — |
Level 2: |  |  |  |  |  |  |  |  |
U.S. treasuries | 29,974 |  |  | (5 | ) |  | 29,969 |  |  | 5,997 |  |  | 23,972 |
Corporate securities | 11,151 |  |  | (4 | ) |  | 11,147 |  |  | — |  |  | 11,147 |
Commercial paper | 13,945 |  |  | — |  |  | 13,945 |  |  | — |  |  | 13,945 |
| $ | 55,070 |  |  | $ | (9 | ) |  | $ | 55,061 |  |  | $ | 5,997 |  |  | $ | 49,064 |
Total | $ | 64,981 |  |  | $ | (9 | ) |  | $ | 64,972 |  |  | $ | 15,908 |  |  | $ | 49,064 |
| December 31, 2016
| Amortized Cost |  | Gross Unrealized Gain (Loss) |  | Estimated Fair Value |  | Cash equivalents |  | Short-term investments
| (in thousands)
Level 1: |  |  |  |  |  |  |  |  |
Money market funds | 25,244 |  |  | — |  |  | 25,244 |  |  | 25,244 |  |  | — |
| $ | 25,244 |  |  | $ | — |  |  | $ | 25,244 |  |  | $ | 25,244 |  |  | — |
Level 2: |  |  |  |  |  |  |  |  |
U.S. treasuries | 22,516 |  |  | (19 | ) |  | 22,497 |  |  | — |  |  | 22,497 |
Corporate securities | 7,353 |  |  | (12 | ) |  | 7,341 |  |  | — |  |  | 7,341 |
Commercial paper | 12,570 |  |  | — |  |  | 12,570 |  |  | — |  |  | 12,570 |
| $ | 42,439 |  |  | $ | (31 | ) |  | $ | 42,408 |  |  | $ | — |  |  | 42,408 |
Total | $ | 67,683 |  |  | $ | (31 | ) |  | $ | 67,652 |  |  | $ | 25,244 |  |  | $ | 42,408 |

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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://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 + Details
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