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Symphony Dynamo, Inc. - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended |  |
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May 09, 2012 | Nov. 03, 2011 | Nov. 02, 2010 | Apr. 30, 2010 | Apr. 16, 2010 | Nov. 30, 2009 | Apr. 30, 2007 | Apr. 18, 2006 | Jun. 30, 2010 | Dec. 31, 2012 | Dec. 31, 2010 | Dec. 31, 2009 | Jun. 30, 2010 Warrant Liability | Apr. 18, 2006 Maximum | Dec. 31, 2012 SDI | Apr. 18, 2006 SDI | Apr. 18, 2006 Holdings
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in SDI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |
Ownership percentage by parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00%
Warrants issued to purchase common stock |  |  |  | 7,038,210 |  | 2,000,000 |  |  |  |  |  |  |  | 2,000,000 |  |  |
Warrants exercisable period |  |  |  | 5 years | 5 years | 5 years |  | 5 years |  |  |  |  |  |  |  |  |
Warrants exercise price |  |  |  | $ 1.50 | $ 1.50 | $ 1.94 |  | $ 7.32 |  |  |  |  |  |  |  |  |
Warrant exercised |  |  |  |  |  |  | 15,000,000 |  |  |  |  |  |  |  |  |  |
Common stock issue on acquisition |  |  |  |  |  | 13,000,000 |  |  |  |  |  |  |  |  |  |  |
Issued note to Holdings, principal amount |  |  |  |  |  | 15,000,000 |  |  |  |  |  |  |  |  |  |  |
Principal amount, due date |  |  |  |  |  | Dec. 31, 2012 |  |  |  |  |  |  |  |  |  |  |
Business acquisition contingent consideration percentage |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Business acquisition upfront payment |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |
Net present value model, discount rate |  |  |  |  |  |  |  |  |  | 17.00% |  |  |  |  |  |  |
Repayment of note payable |  |  |  |  |  |  |  |  |  | 15,000,000 |  |  |  |  |  |  |
Stock issued during period, shares | 17,500,000 | 27,600,000 | 26,450,000 | 1,076,420 |  |  |  |  |  |  | 900,860 | 1,281,100 |  |  |  |  |
Non operating income expense |  |  |  |  |  |  |  |  | 11,100,000 |  |  |  |  |  |  |  |
Changes in warrant liability |  |  |  |  |  |  |  |  |  |  |  |  | 9,500,000 |  |  |  |
Increase in additional paid in capital |  |  |  |  |  |  |  |  |  |  |  |  | 1,600,000 |  |  |  |
Reclassification of warranty liability into equity |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,000,000 |  |  |  |
Warrants outstanding |  |  |  |  |  |  |  |  |  | 10,913,873 |  |  |  |  | 6,765,128 |  |

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