Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Detail)

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Commitments and Contingencies - Additional Information (Detail) (USD $)
Mar. 31, 2013
Commitment And Contingencies [Line Items]  
Future minimum lease obligations, for the year ended December 31, 2013 $ 806,000
Future minimum lease obligations, for the year ended December 31, 2014 659,000
Future minimum lease obligations, for the year ended December 31, 2015 192,000
Future minimum lease obligations, for the year ended December 31, 2016 and thereafter 0
Change in control, if occurs, may require severance benefits payable 714,000
Purchase commitments pending $ 12,900,000