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Cash Equivalents and Investments (Tables) | 9 Months Ended
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Sep. 30, 2017
Cash And Cash Equivalents [Abstract] |
Schedule of Fair Value of Securities, not Including Cash | 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 |
Schedule of Fair Value of Short-term and Long-term Marketable Securities Classified by Maturity | 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 Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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