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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2012
Liabilities, Fair Value Disclosure [Abstract]  
Warrant Liability, Changes in Valuation
Changes in valuation during the years ended December 31, 2011 and the six months ended June 30, 2012, were as follows:
 
 
Level 3
Warrant
Instruments
Balance, December 31, 2011
1,150

Mark-to-market adjustment
169

Balance, June 30, 2012
$
1,319