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           Condensed Consolidated Financial Statement Detail (Tables) 
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        3 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
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           Mar. 31, 2013 
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| Condensed Consolidated Financial Statement Detail [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Outstanding securities considered anti-dilutive | 
 Potentially dilutive securities are excluded from the calculation of loss per share if their inclusion is anti-dilutive. The following table shows the total outstanding securities considered anti-dilutive and therefore excluded from the computation of diluted net loss per share (in thousands): 
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| Accrued liabilities | 
 Accrued liabilities consisted of the following at March 31, 2013 and December 31, 2012 (in thousands): 
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