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FAIR VALUE MEASUREMENTS | 6 Months Ended
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Jun. 30, 2016
Fair Value Disclosures [Abstract] |
FAIR VALUE MEASUREMENTS | FAIR VALUE MEASUREMENTS Cash Equivalents and Short-term Investments The financial instruments of the Company measured at fair value on a recurring basis are cash equivalents and short-term investments. The Company’s fixed income available-for-sale securities consist of high quality, investment grade securities. The Company values these securities based on pricing from pricing vendors, who may use quoted prices in active markets for identical assets (Level 1) or inputs other than quoted prices that are observable either directly or indirectly (Level 2) in determining fair value. The types of instruments valued based on quoted market prices in active markets include money market securities. Such instruments are generally classified within Level 1 of the fair value hierarchy. The types of instruments valued based on quoted prices in markets that are less active, broker or dealer quotations, or alternative pricing sources with reasonable levels of price transparency are generally classified within Level 2 of the fair value hierarchy and include U.S. treasury securities. The types of instruments valued based on unobservable inputs which reflect the reporting entity’s own assumptions or data that market participants would use in valuing an instrument are generally classified within Level 3 of the fair value hierarchy. The Company had no Level 3 instruments as of June 30, 2016 and December 31, 2015. Financial instruments measured at fair value on a recurring basis as of June 30, 2016 and December 31, 2015 are classified based on the valuation technique in the table below:
|  | June 30, 2016 |  |
|  | Fair value measurements using |  |
|  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total
|  | (In thousands)
Assets: |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | — |  |  | $ | 35,932 |  |  | $ | — |  |  | $ | 35,932 |
Money market accounts |  | 6,007 |  |  | — |  |  | — |  |  | 6,007 |
Total assets at fair value |  | $ | 6,007 |  |  | $ | 35,932 |  |  | $ | — |  |  | $ | 41,939 |
The above table excludes $14.3 million of cash held in banks.
|  | December 31, 2015 |  |
|  | Fair value measurements using |  |
|  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total
|  | (In thousands)
Assets: |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | — |  |  | $ | 39,918 |  |  |  |  | $ | 39,918 |
Money market accounts |  | 14,032 |  |  | — |  |  | — |  |  | 14,032 |
Total assets at fair value |  | $ | 14,032 |  |  | $ | 39,918 |  |  | $ | — |  |  | $ | 53,950 |
The above table excludes $11.0 million of cash held in banks. U.S. Treasury securities are classified as short-term investments, and money market accounts are classified as cash equivalents on the Company’s condensed consolidated balance sheets. Short-term Investments
|  | June 30, 2016
|  | Amortized Cost |  | Gross Unrealized Holding Gains |  | Gross Unrealized Holding Losses |  | Fair Value
|  | (In thousands)
U.S. Treasury securities |  | $ | 35,892 |  |  | $ | 40 |  |  | $ | — |  |  | $ | 35,932 |
Total |  | $ | 35,892 |  |  | $ | 40 |  |  | $ | — |  |  | $ | 35,932 |
|  | December 31, 2015
|  | Amortized Cost |  | Gross Unrealized Holding Gains |  | Gross Unrealized Holding Losses |  | Fair Value
|  | (In thousands)
U.S. Treasury securities |  | $ | 39,933 |  |  | $ | — |  |  | $ | (15 | ) |  | $ | 39,918 |
Total |  | $ | 39,933 |  |  | $ | — |  |  | $ | (15 | ) |  | $ | 39,918 |
The contractual maturities of the Company’s available-for-sale securities on June 30, 2016 and December 31, 2015 were all due within one year. There were no transfers of instruments between Level 1 and 2 during the three months and six months ended June 30, 2016 and the year ended December 31, 2015.

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- Definition The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: 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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