Quarterly report pursuant to Section 13 or 15(d)

Lines of Credit - Additional Information (Detail)

v3.10.0.1
Lines of Credit - Additional Information (Detail) - USD ($)
 9 Months Ended
Nov. 09, 2018
Sep. 30, 2018
Sep. 27, 2018
Mar. 06, 2018
Sep. 30, 2018
Oct. 26, 2018
Aug. 13, 2018
Line Of Credit Facility [Line Items]              
Borrowings under lines of credit         $ 3,323,000    
Repayments of lines of credit         1,823,000    
Western Alliance | Subsequent Event              
Line Of Credit Facility [Line Items]              
Repayments of lines of credit $ 900,000            
SWK Funding LLC | Subsequent Event              
Line Of Credit Facility [Line Items]              
Line of credit facility expiration date Nov. 09, 2023            
Line of credit facility term 5 years            
Borrowings under lines of credit $ 12,500,000            
Domestic Revolving Credit Facility              
Line Of Credit Facility [Line Items]              
Line of credit, outstanding borrowings   $ 1,500,000     1,500,000    
Restricted cash balances   $ 0     0    
Line of credit facility, interest rate   7.50%          
Export Revolving Credit Facility              
Line Of Credit Facility [Line Items]              
Line of credit, outstanding borrowings   $ 1,500,000     1,500,000    
Restricted cash balances   $ 0     $ 0    
Line of credit facility, interest rate   7.50%          
Business Financing Agreement              
Line Of Credit Facility [Line Items]              
Line of credit facility, maximum borrowing capacity       $ 6,000,000      
Line of credit facility expiration date       Mar. 06, 2020      
Line of credit facility, interest rate description         Amounts outstanding under the Business Financing Agreement bear interest at a per annum floating rate equal to the greater of 5.0% or the “Prime Rate” published in the Money Rates section of the Western Edition of The Wall Street Journal (or such other rate of interest publicly announced from time to time by Western Alliance as its “Prime Rate”), plus 2.25% with respect to advances made under the line of credit, plus an additional 5.0% during any period that an event of default has occurred and is continuing.    
Line of credit facility, commitment fee amount       $ 67,500      
Line of credit facility, commitment fee description         the Company paid the first of two annual commitment fees totaling $67,500, being 0.25% of the aggregate $6.0 million commitment for the Domestic Revolver and 1.75% of the aggregate $3.0 million commitment for the EXIM Revolver. The commitment fees and the legal costs associated with acquiring the credit facilities were capitalized and are being amortized on a straight-line basis as interest expense over the term of the Business Financing Agreement.    
Business Financing Agreement | Western Alliance              
Line Of Credit Facility [Line Items]              
Line of credit facility, maximum borrowing capacity       6,000,000      
Line of credit, outstanding borrowings   $ 1,500,000     $ 1,500,000    
Business Financing Agreement | Domestic Revolving Credit Facility              
Line Of Credit Facility [Line Items]              
Line of credit facility, maximum borrowing capacity       $ 6,000,000      
Maximum borrowing base percentage of eligible accounts receivable       75.00%      
Line of credit facility commitment fee percentage       0.25%      
Line of credit facility, commitment fee amount       $ 6,000,000      
Business Financing Agreement | Export Revolving Credit Facility              
Line Of Credit Facility [Line Items]              
Line of credit facility, maximum borrowing capacity       $ 3,000,000      
Maximum borrowing base percentage of eligible accounts receivable       85.00%      
Line of credit facility commitment fee percentage       1.75%      
Line of credit facility, commitment fee amount       $ 3,000,000      
Business Financing Agreement | Line of Credit              
Line Of Credit Facility [Line Items]              
Variable interest Rate with respect to advances made       2.25%      
Line of credit facility interest rate during period in event of default       5.00%      
Business Financing Agreement | Line of Credit | Minimum [Member]              
Line Of Credit Facility [Line Items]              
Line of credit facility bearing floating interest rate per annum       5.00%      
Business Financing Modification Agreement | Western Alliance Warrant              
Line Of Credit Facility [Line Items]              
Warrants expiration period       10 years      
Warrants fair value assumptions, expected volatility rate       91.71%      
Warrants fair value assumptions annual dividend per share       $ 0.00      
Warrants fair value assumptions, risk-free interest rate       3.08%      
Warrants, estimated fair value       $ 100,000      
Business Financing Modification Agreement | Western Alliance              
Line Of Credit Facility [Line Items]              
Line of credit facility, maximum borrowing capacity     $ 2,500,000        
Line of credit facility expiration date     Mar. 06, 2019        
Line of credit facility default covenant advance             $ 1,500,000
Line of credit facility minimum unrestricted cash covenant     $ 750,000        
Line of credit facility minimum gross proceeds required from equity or debt financing covenant     5,000,000        
Line of credit, outstanding borrowings     $ 1,500,000        
Business Financing Agreement              
Line Of Credit Facility [Line Items]              
Available borrowings   $ 0     $ 0    
Business Financing Agreement | Western Alliance | Subsequent Event              
Line Of Credit Facility [Line Items]              
Line of credit facility minimum unrestricted cash covenant           $ 300,000  
Repayments of lines of credit $ 900,000