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ACQUISITIONS USSI (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 01, 2012 | Jul. 30, 2012 | Sep. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 years | Feb. 09, 2011 | Jan. 25, 2011
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Investment Owned, Balance, Shares |  |  |  |  |  | 1,155,160 |  |
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions |  |  | 93.60% |  |  |  |  |
Preferred stock purchase USSI | $ 2,500 | $ 2,500 |  | $ 2,500 |  |  |  |
Cumulative Percentage Ownership after All Transactions | 94.40% |  |  |  |  |  |  |
fully diluted ownership | 85.10% |  |  | 71.40% |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  | 65.60% | 80.60% |
Cash amount invested in subsidiary as of the balance sheet date |  |  |  |  |  | 1,500 |  |
Value of the Company’s common stock used to acquire shares of a subsidiary. |  |  |  |  |  | 2,229 |  |
Additional investment by parent company in subsidiary via exercise of options to increase the parent’s investment |  |  |  |  |  |  | 750 | 250
Potential investment amount through exercise of Acorn’s option to invest in USSI. |  |  |  |  | 1,500 |  |  |
Acorn’s potential holding in USSI if the final option to invest in USSI would have been exercised |  |  |  |  | 87.40% |  |  |
Preferred stock purchase USSI - April 2012 |  |  |  | 2,250 |  |  |  |
Parent’s percentage of ownership in subsidiary, following second closing for the purchase of additional stock in accordance with the USSI purchase agreement |  |  |  | 92.00% |  |  |  |
Amount advanced by parent company in contemplation of a new investment agreement |  |  |  |  | 2,000 |  |  |
Net loss attributable to NCI in USSI |  |  |  | 1,108 | 571 | 776 |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  |  | 1,067 | 600 | 2,224 |  |
Estimated fair market value of the acquired technology |  |  |  |  |  | $ 2,565 |  |
Weighted average estimated useful life in years of the acquired technology |  |  |  |  |  | 20 |  |

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