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Marketable Securities (Notes) | 3 Months Ended
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Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | Marketable Securities Marketable securities as of March 31, 2019 and December 31, 2018 consisted of the following:
March 31, 2019 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market mutual funds | $ | 25 |  |  | $ | — |  |  | $ | — |  |  | $ | 25 |
Total marketable securities designated as available-for-sale | $ | 25 |  |  | $ | — |  |  | $ | — |  |  | $ | 25 |
December 31, 2018 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market mutual funds | $ | 25 |  |  | $ | — |  |  | $ | — |  |  | $ | 25 |
Total marketable securities designated as available-for-sale | $ | 25 |  |  | $ | — |  |  | $ | — |  |  | $ | 25 |
The amortized costs and fair value of marketable securities as of March 31, 2019 and December 31, 2018 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.
March 31, 2019 | Amortized Cost |  | Fair Value
Due in less than one year | $ | — |  |  | $ | — |
December 31, 2018 | Amortized Cost |  | Fair Value
Due in less than one year | $ | — |  |  | $ | — |
Interest income from marketable securities was less than $1 and $12 during the three months ended March 31, 2019 and 2018, respectively.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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