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Lines of Credit and Other Borrowings - Additional Information (Detail) (USD $)
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3 Months Ended | 9 Months Ended | 0 Months Ended | 3 Months Ended | 9 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | ||||||||||||||||||
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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May 07, 2013
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Dec. 31, 2012
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Nov. 08, 2013
Subsequent Event
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Sep. 30, 2013
Line of Credit
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Sep. 30, 2012
Line of Credit
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Sep. 30, 2013
Line of Credit
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Sep. 30, 2012
Line of Credit
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Sep. 30, 2013
Comerica Bank
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Sep. 06, 2013
Comerica Bank
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Sep. 30, 2013
September 2013 Comerica Warrant
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Sep. 06, 2013
September 2013 Comerica Warrant
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Mar. 31, 2013
2012 Comerica Warrant
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Dec. 31, 2012
2012 Comerica Warrant
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Sep. 30, 2013
November 2013 Comerica Warrant
Subsequent Event Warrant
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Sep. 30, 2013
Domestic Revolver Credit Facility
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Sep. 06, 2013
Domestic Revolver Credit Facility
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May 07, 2013
Domestic Revolver Credit Facility
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Dec. 31, 2012
Domestic Revolver Credit Facility
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May 07, 2013
Domestic Revolver Credit Facility
Prime rate
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Sep. 30, 2013
Ex-Im Revolver
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Dec. 31, 2012
Ex-Im Revolver
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May 07, 2013
Ex-Im Revolver
Prime rate
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| Line Of Credit Facility [Line Items] | ||||||||||||||||||||||||||
| Lines of credit maximum borrowing capacity | $ 10,000,000 | $ 8,000,000 | $ 8,000,000 | $ 4,000,000 | $ 6,000,000 | $ 4,000,000 | $ 4,000,000 | |||||||||||||||||||
| Outstanding borrowings under lines of credit | 5,500,000 | 5,500,000 | 1,600,000 | 3,500,000 | 2,000,000 | |||||||||||||||||||||
| Line of credit facility, expiration date | May 01, 2014 | |||||||||||||||||||||||||
| Interest on principal balance rate plus | 2.00% | 1.50% | ||||||||||||||||||||||||
| Prime floor rate based on undeterminable LIBOR rate | 2.50% | |||||||||||||||||||||||||
| Unused capacity commitment fee percentage | 0.25% | 0.25% | 0.25% | 0.25% | ||||||||||||||||||||||
| Interest expense incurred for lines of credit | 181,000 | 98,000 | 381,000 | 133,000 | ||||||||||||||||||||||
| Accrued Interest Payable | 9,000 | 9,000 | 19,000 | |||||||||||||||||||||||
| Amortization of deferred debt issuance costs | 71,000 | 38,000 | 152,000 | 53,000 | ||||||||||||||||||||||
| Amortization of discount on lines of credit | 43,000 | 18,000 | 79,000 | 25,000 | ||||||||||||||||||||||
| Minimum equity raise requirement by March 1, 2014 covenant | 3,000,000 | |||||||||||||||||||||||||
| Warrants issued to purchase common stock | 100,000 | 80,000 | 100,000 | |||||||||||||||||||||||
| Warrants price of warrants | 2.00 | 2.00 | 2.00 | |||||||||||||||||||||||
| Number of Comerica Bank warrants exercised | 80,000 | |||||||||||||||||||||||||
| Net issuance of common stock due to exercise of warrants | 40,465 | |||||||||||||||||||||||||
| Expiration date of warrant shares if unexercised | Sep. 06, 2018 | Nov. 08, 2018 | ||||||||||||||||||||||||
| Fair value warrants expected term | 5 years | |||||||||||||||||||||||||
| Fair value warrants volatility rate | 105.32% | |||||||||||||||||||||||||
| Fair value warrants dividend per share | $ 0.00 | |||||||||||||||||||||||||
| Fair value warrants risk free interest rate | 1.77% | |||||||||||||||||||||||||
| Fair value of warrants | 143,000 | |||||||||||||||||||||||||
| Credit Agreements amendment fee | 10,000 | 10,000 | ||||||||||||||||||||||||
| Financed insurance premium | 0 | 0 | 379,000 | |||||||||||||||||||||||
| Number of monthly insurance premium installments payable in 2013 | Nine | |||||||||||||||||||||||||
| Financial insurance premiums interest rate | 3.00% | 3.00% | 3.00% | |||||||||||||||||||||||
| Interest expense incurred for financed insurance premiums | $ 1,000 | $ 0 | $ 5,000 | $ 4,000 | ||||||||||||||||||||||