Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional Information (Detail)

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Commitments and Contingencies - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended
Sep. 27, 2012
May 31, 2009
Lease
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Lease agreements one [Member]
Dec. 31, 2012
Lease agreements two [Member]
Jan. 31, 2010
Operating Leases [Member]
Commitment And Contingencies [Line Items]                  
Extension of operating lease expiration date             Jan. 22, 2014 Aug. 31, 2014 May 31, 2016
Lease agreement commenced             Jun. 01, 2009 Sep. 01, 2009 Apr. 01, 2010
Number of years option to extend the lease beyond the initial term               3 5
Number of lease agreements for office facilities   2              
Lease agreement years                 5 years
Rent expense       $ 1,200,000 $ 1,000,000 $ 700,000      
Other penalty 0                
OFAC Penalties and fines     600,000 900,000          
Expenses related to export compliance matter       $ 300,000