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Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Sep. 30, 2013 Patents [Member] | Dec. 31, 2012 Patents [Member]
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible assets, net of accumulated amortization |  |  |  |  |  | $ 527 | $ 0
Accounts Receivable [Abstract] |  |  |  |  |  |  |
Allowance for doubtful accounts | 115 |  | 115 |  | 49 |  |
Provision for doubtful accounts |  |  | 99 | 119 |  |  |
Accounts receivable charge-offs |  |  | 33 | 23 |  |  |
Revenue Recognition [Abstract] |  |  |  |  |  |  |
Net sales returns provision | 178 | 88 | 648 | 233 |  |  |
Provision charges | $ 153 | $ 135 | $ 485 | $ 161 |  |  |

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