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Marketable Securities (Notes) | 9 Months Ended
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Sep. 30, 2016
Marketable Securities [Abstract] |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | Marketable Securities Included in marketable securities as of September 30, 2016 and December 31, 2015 are the following:
September 30, 2016 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market mutual funds | $ | 23,868 |  |  | $ | — |  |  | $ | — |  |  | $ | 23,868 |
Certificates of deposit | 4,816 |  |  | — |  |  | — |  |  | 4,816 |
Total marketable securities designated as available-for-sale | $ | 28,684 |  |  | $ | — |  |  | $ | — |  |  | $ | 28,684 |
December 31, 2015 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market mutual funds | $ | 13,244 |  |  | $ | — |  |  | $ | — |  |  | $ | 13,244 |
United States treasuries | 1,002 |  |  | — |  |  | — |  |  | 1,002 |
Corporate notes | 2,283 |  |  | 1 |  |  | — |  |  | 2,284 |
Certificates of deposit | 6,089 |  |  | — |  |  | — |  |  | 6,089 |
Total marketable securities designated as available-for-sale | $ | 22,618 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 22,619 |
The amortized costs and fair value of debt securities as of September 30, 2016 and December 31, 2015 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, 2016 | Amortized Cost |  | Fair Value
Due in less than one year | $ | 4,275 |  |  | $ | 4,275 |
Due after one year and within two years | 541 |  |  | 541 |
| $ | 4,816 |  |  | $ | 4,816 |
December 31, 2015 | Amortized Cost |  | Fair Value
Due in less than one year | $ | 5,515 |  |  | $ | 5,516 |
Due after one year and within two years | 3,859 |  |  | 3,859 |
| $ | 9,374 |  |  | $ | 9,375 |
Interest income from marketable securities was $26 and $27 during the three months ended September 30, 2016 and 2015, respectively, and $66 and $88 during the nine months ended September 30, 2016 and 2015, 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 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27405-111563 + Details
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