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           Condensed Consolidated Financial Statement Detail (Tables) 
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        3 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||
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           Mar. 31, 2014 
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| Condensed Consolidated Financial Statement Detail [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||
| Outstanding securities considered 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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| Reconciliation of numerators and denominators of basic and diluted net loss per share | 
 For the three months ended March 31, 2014, the following is a reconciliation of the numerators and denominators of the basic and diluted net loss per share of common stock (in thousands): 
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| Accrued liabilities | 
 Accrued liabilities consisted of the following at March 31, 2014 and December 31, 2013 (in thousands): 
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