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Cash and Investments | 9 Months Ended
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Sep. 30, 2017
Investments Debt And Equity Securities [Abstract] |
Cash and Investments | Note 4. Cash and Investments The following tables present cash, cash equivalents, and available-for-sale investments as of the following dates (in thousands):
|  | September 30, 2017 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Market Value |
Cash |  | $ | 38,235 |  |  | $ | — |  |  | $ | — |  |  | $ | 38,235 |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 812 |  |  |  | — |  |  |  | — |  |  |  | 812 |
Commercial paper and corporate debt securities |  |  | 4,994 |  |  |  | — |  |  |  | — |  |  |  | 4,994 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  |  | 501 |  |  |  | — |  |  |  | — |  |  |  | 501 |
U.S. Government agency securities |  |  | 2,001 |  |  |  | — |  |  |  | (5 | ) |  |  | 1,996 |
Certificate of deposits |  |  | 23,298 |  |  |  | — |  |  |  | — |  |  |  | 23,298 |
Commercial paper |  |  | 17,907 |  |  |  | 3 |  |  |  | — |  |  |  | 17,910 |
Corporate debt securities |  |  | 45,701 |  |  |  | — |  |  |  | (4 | ) |  |  | 45,697 |
Asset-backed securities |  |  | 6,916 |  |  |  | — |  |  |  | (2 | ) |  |  | 6,914 |
Total cash, cash equivalents, and marketable securities |  | $ | 140,365 |  |  | $ | 3 |  |  | $ | (11 | ) |  | $ | 140,357 |
|  | December 31, 2016 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Market Value |
Cash |  | $ | 43,604 |  |  | $ | — |  |  | $ | — |  |  | $ | 43,604 |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 959 |  |  |  | — |  |  |  | — |  |  |  | 959 |
Commercial paper and corporate debt securities |  |  | 2,499 |  |  |  | — |  |  |  | — |  |  |  | 2,499 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  |  | 5,667 |  |  |  | — |  |  |  | — |  |  |  | 5,667 |
U.S. Government agency securities |  |  | 11,412 |  |  |  | — |  |  |  | (7 | ) |  |  | 11,405 |
Certificates of deposits |  |  | 23,000 |  |  |  | 19 |  |  |  | — |  |  |  | 23,019 |
Commercial paper |  |  | 22,402 |  |  |  | — |  |  |  | — |  |  |  | 22,402 |
Corporate debt securities |  |  | 14,194 |  |  |  | — |  |  |  | (6 | ) |  |  | 14,188 |
Municipal securities |  |  | 756 |  |  |  | — |  |  |  | (1 | ) |  |  | 755 |
Asset-backed securities |  |  | 5,466 |  |  |  | — |  |  |  | (3 | ) |  |  | 5,463 |
Total cash, cash equivalents, and marketable securities |  | $ | 129,959 |  |  | $ | 19 |  |  | $ | (17 | ) |  | $ | 129,961 |
Available-for-sale marketable securities, readily convertible to cash, with maturity dates of 90 days or less are classified as cash equivalents, while those with maturity dates greater than 90 days are classified as marketable securities within short-term assets. All marketable securities as of September 30, 2017 and December 31, 2016, were available-for-sale and reported at fair value based on the estimated or quoted market prices as of the balance sheet date. Realized gains and losses on sale of securities are recorded in other income (expense), net, in the Company’s statement of operations. For the three months ended September 30, 2017 and September 24, 2016, net realized gains and losses were not material. For the nine months ended September 30, 2017 and September 24, 2016, net realized gains and losses were $0.9 million and $0.3 million, respectively. Unrealized gains or losses, net of tax effect, are recorded in accumulated other comprehensive income (loss) within stockholders’ equity. Both the gross unrealized gains and gross unrealized losses for the three and nine months ended September 30, 2017 and September 24, 2016 were not material and no marketable securities had other than temporary impairment. All marketable securities as of September 30, 2017 and December 31, 2016, had maturity dates of less than two years.

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- Definition The entire disclosure for investments in certain debt and equity 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 944 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=4738149 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2289146 + Details
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