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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2016
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] | The following table presents the Company’s financial assets and liabilities that are measured at fair value on a recurring basis which were comprised of the following types of instruments at December 31, 2015 and 2016:
|  | Fair Value Measurements at |
|  | December 31, 2015 Using |
|  | Level 1 | Level 2 | Level 3 |
|  | (in thousands) |
Assets: |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |
Time deposits with original maturities less than three months |  | $ | 5,918 |  |  | - |  |  | - |
Marketable securities available-for-sale: |  |  |  |  |  |  |  |  |  |
Time deposit with original maturities more than three months |  |  | - |  |  | 5,428 |  |  | - |
Money market fund |  |  | 13,083 |  |  | - |  |  | - |
Restricted marketable securities: |  |  |  |  |  |  |  |  |  |
Time deposits with original maturities of more than three months |  |  | - |  |  | 563 |  |  | - |
Total |  | $ | 19,001 |  |  | 5,991 |  |  | - |
Liabilities: |  |  |  |  |  |  |  |  |  |
Short-term debt |  | $ | - |  |  | 180,000 |  |  | - |
Total |  | $ | - |  |  | 180,000 |  |  | - |
|  | Fair Value Measurements at |
|  | December 31, 2016 Using |
|  | Level 1 | Level 2 | Level 3 |
|  | (in thousands) |
Assets: |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |
Time deposits with original maturities less than three months |  | $ | 13,055 |  |  | - |  |  | - |
Marketable securities available-for-sale: |  |  |  |  |  |  |  |  |  |
Time deposit with original maturities more than three months |  |  | - |  |  | 5,140 |  |  | - |
Money market fund |  |  | 5,017 |  |  | - |  |  | - |
Restricted marketable securities: |  |  |  |  |  |  |  |  |  |
Time deposits with original maturities of more than three months |  |  | - |  |  | 324 |  |  | - |
Total |  | $ | 18,072 |  |  | 5,464 |  |  | - |
Liabilities: |  |  |  |  |  |  |  |  |  |
Short-term debt |  | $ | - |  |  | 138,000 |  |  | - |
Total |  | $ | - |  |  | 138,000 |  |  | - |
Fair Value Measurements, Nonrecurring [Table Text Block] | The following table presents fair value measurements of assets that are measured at fair value on a nonrecurring basis at December 31, 2014 and the associated losses recognized in 2014 (nil in 2015 and 2016):
|  | Fair Value Measurements at |
|  | reporting Date Using |
|  |  |  |  |  | For the |
|  |  |  |  |  | Year |
|  |  |  |  |  | Ended |
|  |  |  |  |  | December |
|  |  |  |  |  | 31, 2014 |
|  | December |  |  |  | Impairment |
|  | 31, 2014 |  | Level 1 |  | Level 2 |  | Level 3 |  | loss |
|  | (in thousands) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in Non-marketable Equity Securities- Oculon Optoelectronics Inc. |  | $ | - |  |  | - |  |  | - |  |  | - |  |  | 309 |
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table Text Block] | The following table summarizes changes in Level 3 assets and liabilities measured at fair value on a recurring basis for the years ended December 31, 2014, 2015 and 2016:
|  | Warrant |
|  | obligation |
|  | (in thousands) |
Balance at January 1, 2014 |  | $ | 1,255 |
Gain for expiration of the warrant included in earnings |  |  | (1,255) |
Balance at December 31, 2014 |  | $ | - |
Balance at December 31, 2015 |  | $ | - |
Balance at December 31, 2016 |  | $ | - |

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- Definition Tabular disclosure of the amount of gains or losses for the period included in earnings or resulted in a change to net assets, have arisen from the use of significant unobservable inputs (level 3) to measure the fair value of assets, liabilities, and financial instruments classified in shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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