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Marketable Securities | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | Marketable Securities Marketable securities consisted of the following as of December 31, 2017 and 2016:
December 31, 2017 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market mutual funds | $ | 7,318 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,318 |
United States treasuries | 1,002 |  |  | — |  |  | (1 | ) |  | 1,001 |
Total marketable securities designated as available-for-sale | $ | 8,320 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 8,319 |
December 31, 2016 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market mutual funds | $ | 21,848 |  |  | $ | — |  |  | $ | — |  |  | $ | 21,848 |
Certificates of deposit | 3,864 |  |  | — |  |  | — |  |  | 3,864 |
Total marketable securities designated as available-for-sale | $ | 25,712 |  |  | $ | — |  |  | $ | — |  |  | $ | 25,712 |
The amortized costs and fair value of debt securities as of December 31, 2017 and 2016 are shown below by effective maturity. Effective maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.
December 31, 2017 | Amortized Cost |  | Fair Value
Due in less than one year | $ | 1,002 |  |  | $ | 1,001 |
Due after one year and within two years | — |  |  | — |
| $ | 1,002 |  |  | $ | 1,001 |
December 31, 2016 | Amortized Cost |  | Fair Value
Due in less than one year | $ | 3,864 |  |  | $ | 3,864 |
Due after one year and within two years | — |  |  | — |
| $ | 3,864 |  |  | $ | 3,864 |
Interest income from cash equivalents and marketable securities was $107 and $94 for the years ended December 31, 2017 and 2016, respectively.

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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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