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Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2017
Marketable Securities [Abstract] |
Available-for-sale Securities [Table Text Block] | securities as of June 30, 2017 and December 31, 2016 consisted of the following:
June 30, 2017 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market mutual funds | $ | 8,031 |  |  | $ | — |  |  | $ | — |  |  | $ | 8,031 |
United States treasuries | 4,014 |  |  | — |  |  | (3 | ) |  | 4,011 |
Certificates of deposit | 1,729 |  |  | — |  |  | — |  |  | 1,729 |
Total marketable securities designated as available-for-sale | $ | 13,774 |  |  | $ | — |  |  | $ | (3 | ) |  | $ | 13,771 |
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 |
Available-for-sale Securities, Debt Maturities, Amortized Cost And Fair Value Basis [Table Text Block] | The amortized costs and fair value of marketable securities as of June 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.
June 30, 2017 | Amortized Cost |  | Fair Value
Due in less than one year | $ | 5,743 |  |  | $ | 5,740 |
December 31, 2016 | Amortized Cost |  | Fair Value
Due in less than one year | $ | 3,864 |  |  | $ | 3,864 |

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- Definition Available-for-sale Securities, Debt Maturities, Amortized Cost And Fair Value Basis [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 5: 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 6: 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 7: 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 + Details
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