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Marketable Securities Marketable Securities | 6 Months Ended
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Jun. 30, 2018
Marketable Securities [Abstract] |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | Marketable Securities Marketable securities as of June 30, 2018 and December 31, 2017 consisted of the following:
June 30, 2018 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market mutual funds | $ | 335 |  |  | $ | — |  |  | $ | — |  |  | $ | 335 |
Total marketable securities designated as available-for-sale | $ | 335 |  |  | $ | — |  |  | $ | — |  |  | $ | 335 |
December 31, 2017 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market mutual funds | $ | 7,318 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,318 |
Certificates of deposit | 1,002 |  |  | — |  |  | (1 | ) |  | 1,001 |
Total marketable securities designated as available-for-sale | $ | 8,320 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 8,319 |
The amortized costs and fair value of marketable securities as of June 30, 2018 and December 31, 2017 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.
June 30, 2018 | Amortized Cost |  | Fair Value
Due in less than one year | $ | — |  |  | $ | — |
December 31, 2017 | Amortized Cost |  | Fair Value
Due in less than one year | $ | 1,002 |  |  | $ | 1,001 |
Interest income from marketable securities was $3 and $30 during the three months ended June 30, 2018 and 2017,

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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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