Quarterly report pursuant to Section 13 or 15(d)

Lines of Credit - Additional Information (Detail)

v3.8.0.1
Lines of Credit - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 06, 2018
Mar. 31, 2018
Line Of Credit Facility [Line Items]      
Line of credit, outstanding borrowings $ 1,823,000   $ 1,823,000
Restricted cash balances 0   0
Western Alliance Warrant      
Line Of Credit Facility [Line Items]      
Warrants expiration period   10 years  
Warrants fair value assumptions, expected volatility rate   91.49%  
Warrants fair value assumptions annual dividend per share   $ 0.00  
Warrants fair value assumptions, risk-free interest rate   2.88%  
Warrants, estimated fair value   $ 100,000  
Domestic Revolving Credit Facility      
Line Of Credit Facility [Line Items]      
Line of credit, outstanding borrowings $ 600,000   600,000
Line of credit facility, interest rate 6.25%    
Export Revolving Credit Facility      
Line Of Credit Facility [Line Items]      
Line of credit, outstanding borrowings $ 1,200,000   1,200,000
Line of credit facility, interest rate 6.25%    
Business Financing Agreement      
Line Of Credit Facility [Line Items]      
Borrowings relating to eligible accounts receivable   $ 6,000,000  
Line of credit facility expiration date   Mar. 06, 2020  
Total amount available $ 2,800,000   $ 2,800,000
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 4.5% 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 1.5% 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 | Domestic Revolving Credit Facility      
Line Of Credit Facility [Line Items]      
Borrowings relating to eligible accounts receivable   $ 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]      
Borrowings relating to eligible accounts receivable   $ 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   1.50%  
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   4.50%