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Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Customer
Segment
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Customer
Summary Of Significant Accounting Policies [Line Items]      
Number of major customers representing outstanding trade receivables | Customer 2   3
Life of inventory 2 years    
Protracted length of inventory 1 year    
Inventory valuation reserves $ 1,600,000   $ 1,800,000
Estimated useful life of intangible assets 10 years    
Number of reportable segments | Segment 1    
Impairment charges on long-lived assets $ 0 $ 0  
Period of warranty 1 year    
Warranty claim liability $ 0   0
Other current assets 6,333,000   4,755,000
Other assets 2,341,000   2,579,000
Debt - current 4,527,000   2,956,000
Debt - non-current $ 15,301,000   16,848,000
Computer Software, Intangible Asset      
Summary Of Significant Accounting Policies [Line Items]      
Enterprise resource planning system, estimated useful life 5 years    
Accounting Standards Update 2015-03 | Scenario, Previously Reported      
Summary Of Significant Accounting Policies [Line Items]      
Other current assets     32,000
Other assets     36,000
Accounting Standards Update 2015-03 | Scenario, Adjustment      
Summary Of Significant Accounting Policies [Line Items]      
Other current assets     (32,000)
Other assets     (36,000)
Debt - current     (32,000)
Debt - non-current     $ (36,000)
Trade Accounts Receivable | Customer Concentration Risk      
Summary Of Significant Accounting Policies [Line Items]      
Concentration risk, percentage 48.00%   49.00%
Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Estimated useful life of property and equipment 3 years    
Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Estimated useful life of property and equipment 5 years