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Restatement of the Condensed Consolidated Financial Statements - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2012
Inventory Reserves [Member]
Dec. 31, 2012
Inventory Reserves [Member]
Jun. 30, 2013
Distributor Revenue [Member]
Distributor
Dec. 31, 2012
Distributor Revenue [Member]
Distributor
Increase (Decrease) in net sales $ 6,100,000   $ 13,200,000        
Increase (Decrease) in net income from continuing operations 4,100,000   7,700,000        
Distributors that did not meet the fixed or determinable or collectability revenue recognition criteria           4  
Number of distributer terminated             2
Sales return             3,300,000
Increase (decrease) in accounts receivable   (13,124,000) 11,482,000       (41,300,000)
Increase (Decease) in inventory   12,882,000 (2,270,000)   (14,800,000)   (11,000,000)
Increase (decrease) in inventory reserve       $ 1,200,000