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Marketable Securities (Notes) | 9 Months Ended
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Sep. 30, 2017
Marketable Securities [Abstract] |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | Marketable Securities Marketable securities as of September 30, 2017 and December 31, 2016 consisted of the following:
September 30, 2017 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market mutual funds | $ | 5,545 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,545 |
United States treasuries | 2,010 |  |  | — |  |  | (1 | ) |  | 2,009 |
Certificates of deposit | 743 |  |  | — |  |  | — |  |  | 743 |
Total marketable securities designated as available-for-sale | $ | 8,298 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 8,297 |
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 marketable securities as of September 30, 2017 and December 31, 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.
September 30, 2017 | Amortized Cost |  | Fair Value
Due in less than one year | $ | 2,753 |  |  | $ | 2,752 |
December 31, 2016 | Amortized Cost |  | Fair Value
Due in less than one year | $ | 3,864 |  |  | $ | 3,864 |
Interest income from marketable securities was $25 and $26 during the three months ended September 30, 2017 and 2016,

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