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Restatement of the Condensed Consolidated Financial Statements - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 6 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Jun. 30, 2012
Inventory Reserves [Member]
Dec. 31, 2012
Inventory Reserves [Member]
Sep. 30, 2013
Distributor Revenue [Member]
Distributors
Dec. 31, 2012
Distributor Revenue [Member]
Distributor
Increase (Decrease) in net sales $ 6,900,000   $ 20,100,000        
Increase (Decrease) in net income 2,500,000   10,300,000        
Number of distributer terminated             2
Sales return             3,300,000
Distributors that did not meet the fixed or determinable or collectability revenue recognition criteria           4  
Increase (Decrease) in accounts receivable   (27,758,000) 14,169,000       (41,300,000)
Increase (Decease) in inventory   11,596,000 (325,000)   (14,800,000)   11,000,000
Increase (Decrease) in inventory reserve       $ 1,200,000