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Lines of Credit and Other Borrowings - Additional Information (Detail) (USD $)
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3 Months Ended | 6 Months Ended | 3 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 3 Months Ended | ||||||||||||||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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May 07, 2013
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Dec. 31, 2012
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Mar. 31, 2013
Comerica Bank
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Dec. 31, 2012
Comerica Bank
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Jun. 30, 2013
Lines of Credit
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Jun. 30, 2012
Lines of Credit
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Jun. 30, 2013
Lines of Credit
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Jun. 30, 2012
Lines of Credit
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Jun. 30, 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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May 07, 2013
Domestic Revolver Credit Facility
LIBOR rate
Prior to amendment
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Jun. 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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May 07, 2013
Ex-Im Revolver
LIBOR rate
Prior to amendment
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| Line Of Credit Facility [Line Items] | |||||||||||||||||||||
| Lines of credit borrowing capacity | $ 7,500,000 | $ 7,500,000 | $ 10,000,000 | $ 8,000,000 | $ 6,000,000 | $ 4,000,000 | $ 4,000,000 | ||||||||||||||
| Outstanding borrowings under lines of credit | 6,000,000 | 6,000,000 | 1,600,000 | 3,200,000 | 2,800,000 | ||||||||||||||||
| Line of credit facility, expiration date | May 01, 2014 | ||||||||||||||||||||
| Prime floor rate based on adjusting LIBOR rate | 2.50% | 2.50% | |||||||||||||||||||
| Interest on principal balance rate plus | 2.00% | 5.25% | 1.50% | 4.25% | |||||||||||||||||
| Prime floor rate based on undeterminable LIBOR rate | 2.50% | ||||||||||||||||||||
| LIBOR floor | 1.00% | 1.00% | |||||||||||||||||||
| Unused capacity commitment fee percentage | 0.25% | 0.25% | |||||||||||||||||||
| Interest expense incurred for lines of credit | 116,000 | 38,000 | 200,000 | 38,000 | |||||||||||||||||
| Accrued Interest Payable | 26,000 | 26,000 | 19,000 | ||||||||||||||||||
| Amortization of deferred debt issuance costs | 43,000 | 15,000 | 81,000 | 15,000 | |||||||||||||||||
| Amortization of discount on lines of credit | 18,000 | 7,000 | 36,000 | 7,000 | |||||||||||||||||
| Warrants issued to purchase common stock | 80,000 | ||||||||||||||||||||
| Warrants price of warrants | 2.00 | ||||||||||||||||||||
| Number of Comerica Bank warrants exercised | 80,000 | ||||||||||||||||||||
| Net issuance of common stock due to exercise of warrants | 40,465 | ||||||||||||||||||||
| Financed insurance premium | 85,000 | 85,000 | 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 | $ 1,000 | $ 4,000 | $ 4,000 | |||||||||||||||||