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Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 item | Dec. 31, 2011
Risk Concentration |  |
Number of major U.S. financial institutions with whom cash, cash equivalents and investments are maintained | 2 |
Number of suppliers from whom certain components may be available | 1 |
Property and equipment |  |
Depreciation and amortization | $ 155 | $ 109
Equipment and furniture and fixtures | Minimum |  |
Property and equipment |  |
Estimated useful lives | 1 year |
Equipment and furniture and fixtures | Maximum |  |
Property and equipment |  |
Estimated useful lives | 5 years |
Leasehold improvements | Minimum |  |
Property and equipment |  |
Estimated useful lives | 2 years |
Leasehold improvements | Maximum |  |
Property and equipment |  |
Estimated useful lives | 5 years |

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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