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Cash Equivalents and Investments | 9 Months Ended
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Sep. 30, 2017
Cash And Cash Equivalents [Abstract] |
Cash Equivalents and Investments | 3. Cash Equivalents and Investments The fair value of securities, not including cash at September 30, 2017 and December 31, 2016, were as follows (in thousands):
|  | September 30, 2017 |
|  | Amortized |  |  | Gross Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
Money market funds |  | $ | 5,722 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,722 |
U.S. government securities |  |  | 35,942 |  |  |  | 1 |  |  |  | (26 | ) |  |  | 35,917 |
Corporate notes |  |  | 15,669 |  |  |  | 1 |  |  |  | (4 | ) |  |  | 15,666 |
Commercial paper |  |  | 48,130 |  |  |  | — |  |  |  | — |  |  |  | 48,130 |
Total available-for-sale securities |  | $ | 105,463 |  |  | $ | 2 |  |  | $ | (30 | ) |  | $ | 105,435 |
Classified as: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 18,418 |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 87,017 |
Total cash equivalents and investments |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 105,435 |
|  | December 31, 2016 |
|  | Amortized |  |  | Gross Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
Money market funds |  | $ | 45,937 |  |  | $ | — |  |  | $ | — |  |  | $ | 45,937 |
U.S. government securities |  |  | 16,479 |  |  |  | 11 |  |  |  | — |  |  |  | 16,490 |
Corporate notes |  |  | 23,947 |  |  |  | — |  |  |  | (20 | ) |  |  | 23,927 |
Commercial paper |  |  | 24,971 |  |  |  | — |  |  |  | — |  |  |  | 24,971 |
Total available-for-sale securities |  | $ | 111,334 |  |  | $ | 11 |  |  | $ | (20 | ) |  | $ | 111,325 |
Classified as: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 45,937 |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 54,407 |
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,981 |
Total cash equivalents and investments |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 111,325 |
Available-for-sale securities held as of September 30, 2017 had a weighted average days to maturity of 122 days. There have been no material realized gains or realized losses on available-for-sale securities for the periods presented. As the carrying value approximates the fair value for the Company’s cash equivalents, short-term and long-term investments shown in the tables above, the following table summarizes the fair value of the Company’s cash equivalents, short-term and long-term investments classified by maturity (in thousands):
|  | September 30, |  |  | December 31, |
|  | 2017 |  |  | 2016 |
Due within one year |  | $ | 105,435 |  |  | $ | 100,344 |
Due after one year through three years |  |  | — |  |  |  | 10,981 |
Total available-for-sale marketable debt securities |  | $ | 105,435 |  |  | $ | 111,325 |

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- Definition The entire disclosure of the components of cash, cash equivalents, and short-term investments. Short-term investments may include current marketable securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 305 -URI http://asc.fasb.org/topic&trid=2122426 + Details
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