Lines of Credit - Additional Information (Detail) - USD ($)				6 Months Ended
	Aug. 13, 2018	Jun. 30, 2018	Mar. 06, 2018	Jun. 30, 2018
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		$ 0		$ 0
Restricted cash balances		$ 0		0
Line of credit facility, interest rate		6.50%
Export Revolving Credit Facility
Line Of Credit Facility [Line Items]
Line of credit, outstanding borrowings		$ 0		0
Restricted cash balances		$ 0		0
Line of credit facility, interest rate		6.50%
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
Total amount available		$ 3,900,000		$ 3,900,000
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 | Western Alliance
Line Of Credit Facility [Line Items]
Line of credit, outstanding borrowings		$ 0		$ 0
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			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%
Forbearance Agreement | Western Alliance | Subsequent Event
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 1,500,000
Line of credit fees paid for non compilance with non financial covenants	$ 5,000