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Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Segment
Customer
Dec. 31, 2012
Dec. 31, 2011
Significant Accounting Policies [Line Items]      
Allowance for doubtful accounts $ 618,000.0 $ 1,100,000  
Obsolete or slow-moving inventory 400,000 700,000  
Number of operating segment 1    
Goodwill 1,867,000 0  
Other intangibles, net 480,000 0  
Amortization expense for other intangible assets 0 200,000  
Acquisition-related costs 2,000,000    
Postage and handling costs 500,000 500,000 100,000
Minimum Percentage of income Tax examination likelihood of tax benefits being realized upon ultimate resolution settlement 50.00%    
Antidilutive securities excluded from computation of earnings per share amount 7,012,000 2,173,000 1,262,000
Number of major customers 3    
Probability of change in control assumed 15.00%    
Interest income, net non-cash credits $ 2,000,000    
Customer 1
      
Significant Accounting Policies [Line Items]      
Revenue from major customers as percentage of total revenues 21.00%    
Customer 2
      
Significant Accounting Policies [Line Items]      
Revenue from major customers as percentage of total revenues 12.00%    
Customer 3
      
Significant Accounting Policies [Line Items]      
Revenue from major customers as percentage of total revenues 6.00%    
Accounts Receivable
      
Significant Accounting Policies [Line Items]      
Number of major customers 2    
Number of financing companies 2    
Accounts Receivable | Financing Company 1
      
Significant Accounting Policies [Line Items]      
Concentration of risk percentage 24.00%    
Accounts Receivable | Financing Company 2
      
Significant Accounting Policies [Line Items]      
Concentration of risk percentage 14.00%    
Accounts Receivable | Customer 1
      
Significant Accounting Policies [Line Items]      
Concentration of risk percentage 4.00%    
Accounts Receivable | Customer 2
      
Significant Accounting Policies [Line Items]      
Concentration of risk percentage 2.00%    
Supplier Concentration Risk | Single Supplier
      
Significant Accounting Policies [Line Items]      
Concentration of risk percentage 30.00%    
Minimum
      
Significant Accounting Policies [Line Items]      
Property Plant And Equipment, estimated useful lives 3 years    
Maximum
      
Significant Accounting Policies [Line Items]      
Property Plant And Equipment, estimated useful lives 20 years    
Amortization period of other intangible assets 12 years