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Business and Basis of Presentation (Detail)
3 Months Ended 6 Months Ended 12 Months Ended
Nov. 18, 2019
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Organization And Basis Of Presentation [Line Items]                  
Restructuring Charges           $ 2,300,000      
Accounts receivable, net   $ 407,661   $ 407,661   298,967      
Net proceeds from issuance of stock and warrants       4,151,037 $ 7,497        
Accumulated deficit   196,298,920   196,298,920   194,789,605      
Cash and cash equivalents   5,434,983   5,434,983   3,126,206      
Allowance for doubtful accounts   70,000   70,000   70,000      
Reverse stock split conversion ratio 0.1                
Prepaid expenses and other current assets   (187,710)   (187,710)   (652,919)      
Assets, Current   (7,403,682)   (7,403,682)   (5,430,814)      
Accrued Sales Return provisions   598,000   598,000   689,000      
Liabilities, Current   (2,418,784)   (2,418,784)   (3,446,778)      
Operating Lease, Liability, Noncurrent   (698,128)   (698,128)   (916,674)      
Stockholders' Equity Attributable to Parent   5,488,616 $ 4,857,650 5,488,616 4,857,650 2,530,234 $ 2,514,118 $ 8,192,411 $ 6,097,811
Cost of revenues   495,086 3,143,787 1,115,276 5,468,018        
Gross Profit   864,893 (789,104) 2,416,739 9,600        
Net Income (Loss) Available to Common Stockholders, Diluted   (851,944) (3,362,191) (1,509,315) (1,311,684)        
Compensation cost not yet recognized   270,740   $ 270,740          
Compensation cost not yet recognized, period for recognition       6 months          
Operating Lease, Right-of-Use Asset   (934,258)   $ (934,258)   (1,159,774)      
Other long-term assets   (29,229)   (29,229)   (29,650)      
Assets   (8,605,528)   (8,605,528)   (6,893,686)      
Accrued Liabilities, Current   (1,035,923)   (1,035,923)   (1,443,574)      
Liabilities   (3,116,912)   (3,116,912)   $ (4,363,452)      
Collaboration Income   $ 0 $ 1,381,818 $ 0 $ 7,116,667        
One Customer | Revenue | Customer Concentration Risk                  
Organization And Basis Of Presentation [Line Items]                  
Concentration risk, percentage       20.00% 20.00%        
Four Customers | Accounts Receivable | Customer Concentration Risk                  
Organization And Basis Of Presentation [Line Items]                  
Concentration risk, percentage       89.00%          
Two Customers | Revenue | Customer Concentration Risk                  
Organization And Basis Of Presentation [Line Items]                  
Concentration risk, percentage     31.00%            
Two Customers | Accounts Receivable | Customer Concentration Risk                  
Organization And Basis Of Presentation [Line Items]                  
Concentration risk, percentage           62.00%      
Three Customers | Revenue | Customer Concentration Risk                  
Organization And Basis Of Presentation [Line Items]                  
Concentration risk, percentage   42.00%