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Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Fair Value of Financial Instruments |  |  |  |
Cash and cash equivalents, cost | $ 3,040 | $ 4,364 | $ 8,172 | $ 2,529
Cash and cash equivalents, fair value | 3,040 | 4,364 |  |
Estimated fair values of financial instruments |  |  |  |
Unrealized Gains | 21 | 23 |  |
Unrealized Losses | (11) | (10) |  |
Short-term investments |  |  |  |
Estimated fair values of financial instruments |  |  |  |
Cost | 27,975 | 32,183 |  |
Unrealized Gains | 20 | 14 |  |
Unrealized Losses | (1) | (5) |  |
Fair Value | 27,994 | 32,192 |  |
Short-term investments | U.S. government debt securities |  |  |  |
Estimated fair values of financial instruments |  |  |  |
Cost | 11,667 | 19,944 |  |
Unrealized Gains | 5 | 11 |  |
Unrealized Losses |  | (1) |  |
Fair Value | 11,672 | 19,954 |  |
Short-term investments | Corporate notes |  |  |  |
Estimated fair values of financial instruments |  |  |  |
Cost | 12,524 | 7,245 |  |
Unrealized Gains | 14 | 2 |  |
Unrealized Losses | (1) | (2) |  |
Fair Value | 12,537 | 7,245 |  |
Short-term investments | Certificates of deposit |  |  |  |
Estimated fair values of financial instruments |  |  |  |
Cost | 3,784 | 4,994 |  |
Unrealized Gains | 1 | 1 |  |
Unrealized Losses |  | (2) |  |
Fair Value | 3,785 | 4,993 |  |
Long-term investments |  |  |  |
Estimated fair values of financial instruments |  |  |  |
Cost | 9,115 | 13,922 |  |
Unrealized Gains | 1 | 9 |  |
Unrealized Losses | (10) | (5) |  |
Fair Value | 9,106 | 13,926 |  |
Long-term investments | U.S. government debt securities |  |  |  |
Estimated fair values of financial instruments |  |  |  |
Cost | 2,800 | 3,016 |  |
Unrealized Losses | (2) |  |  |
Fair Value | 2,798 | 3,016 |  |
Long-term investments | Corporate notes |  |  |  |
Estimated fair values of financial instruments |  |  |  |
Cost | 6,075 | 9,466 |  |
Unrealized Gains | 1 | 9 |  |
Unrealized Losses | (8) | (1) |  |
Fair Value | 6,068 | 9,474 |  |
Long-term investments | Certificates of deposit |  |  |  |
Estimated fair values of financial instruments |  |  |  |
Cost | 240 | 1,440 |  |
Unrealized Losses |  | (4) |  |
Fair Value | $ 240 | $ 1,436 |  |

X
- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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