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Summary of Significant Accounting Policies- Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Jan. 02, 2017
Dec. 31, 2016
Significant Accounting Policies [Line Items]        
Deferred revenue $ 2,600,000     $ 2,500,000
Sales commissions $ 113,000 $ 67,000    
Percentage of cash discount offered to customers 2.00%      
Deferred tax assets, valuation allowance $ 38,200,000      
Revenue Recognition, Milestone Method, Revenue Recognized 141,000 262,000    
Operating Loss Carryforwards     $ 2,500,000  
Other Sales Revenue Net 55,806 698,449    
ABG [Member]        
Significant Accounting Policies [Line Items]        
Purchase Order Placed 3,300,000      
Other Sales Revenue Net 56,000 698,000    
License and Services Revenue 56,000      
Genetic Test Revenue [Member]        
Significant Accounting Policies [Line Items]        
Breakage Revenue 12,000 61,000    
Customer Payment [Member]        
Significant Accounting Policies [Line Items]        
Deferred revenue 150,000      
Kits Components [Member]        
Significant Accounting Policies [Line Items]        
Deferred revenue 2,400,000      
Distributors [Member]        
Significant Accounting Policies [Line Items]        
Deferred revenue $ 2,230,000      
Maximum [Member] | ABG [Member]        
Significant Accounting Policies [Line Items]        
License and Services Revenue   637,000    
Minimum [Member] | ABG [Member]        
Significant Accounting Policies [Line Items]        
License and Services Revenue   $ 61,000