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Available-for-sale securities (Tables) | 6 Months Ended
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Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract] |
Investments Classified by Contractual Maturity Date [Table Text Block] | The contractual maturities of available-for-sale securities were as follows:
| June 30, 2016
(in thousands) | Less than 12 months |  | 1-3 Years |  | Over 3 Years |  | Total
Certificates of deposit | $ | — |  |  | — |  |  | 258 |  |  | 258 |
Corporate bonds | 1,004 |  |  | 4,881 |  |  | 1,847 |  |  | 7,732 |
Total | $ | 1,004 |  |  | 4,881 |  |  | 2,105 |  |  | 7,990 |
Available-for-sale Securities [Table Text Block] |
| June 30, 2016
(in thousands) | Amortized Cost |  | Gains in Accumulated Other Comprehensive Loss |  | Losses in Accumulated Other Comprehensive Loss |  | Estimated Fair Value
Certificates of deposit | $ | 250 |  |  | 8 |  |  | — |  |  | 258 |
Corporate bonds | 7,746 |  |  | — |  |  | (14 | ) |  | 7,732 |
Total | $ | 7,996 |  |  | 8 |  |  | (14 | ) |  | 7,990 |
(in thousands) | December 31, 2015
| Amortized Cost |  | Gains in Accumulated Other Comprehensive Loss |  | Losses in Accumulated Other Comprehensive Loss |  | Estimated Fair Value
Certificates of deposit | $ | 1,500 |  |  | 1 |  |  | — |  |  | 1,501 |
Corporate bonds | 6,465 |  |  | — |  |  | (44 | ) |  | 6,421 |
| $ | 7,965 |  |  | 1 |  |  | (44 | ) |  | 7,922 |

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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=27724398&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=27724398&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=27724398&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=27724398&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=27724398&loc=d3e27290-111563 + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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