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Lines of Credit and Other Borrowings - Additional Information (Detail) (USD $)
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12 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 12 Months Ended | 1 Months Ended | |||||||||||||||||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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May 24, 2012
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May 07, 2013
Prime rate
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Dec. 31, 2013
Line of Credit
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Dec. 31, 2012
Line of Credit
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Dec. 31, 2011
Loan And Security Agreement
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Mar. 04, 2014
Subsequent Event
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Mar. 04, 2014
Comerica Bank
Subsequent Event
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Dec. 31, 2012
2012 Comerica Warrant
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Dec. 31, 2013
September 2013 Comerica Warrant
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Sep. 06, 2013
September 2013 Comerica Warrant
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Dec. 31, 2013
November 2013 Comerica Warrant
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Nov. 08, 2013
November 2013 Comerica Warrant
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Feb. 28, 2011
MidCap Financial Llc and Silicon Valley Bank
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May 31, 2010
MidCap Financial Llc and Silicon Valley Bank
Securities
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Dec. 31, 2013
Domestic Revolver Credit Facility
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May 24, 2012
Domestic Revolver Credit Facility
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May 07, 2013
Domestic Revolver Credit Facility
Prime rate
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Dec. 31, 2013
Ex-Im Revolver
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May 24, 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 | $ 8,000,000 | $ 5,000,000 | $ 4,000,000 | $ 4,000,000 | |||||||||||||||||||
| Outstanding borrowings under lines of credit | 4,600,000 | 1,800,000 | 2,800,000 | ||||||||||||||||||||
| Line of credit facility, expiration date | May 01, 2014 | ||||||||||||||||||||||
| Interest on principal balance rate plus | 2.00% | 1.50% | |||||||||||||||||||||
| Prime Floor, daily prime plus LIBOR | 2.50% | ||||||||||||||||||||||
| Unused capacity commitment fee percentage | 0.25% | ||||||||||||||||||||||
| Interest expense incurred for lines of credit and loan and security agreement | 599,000 | 232,000 | 293,000 | ||||||||||||||||||||
| Amortization of deferred debt issuance costs | 197,000 | 91,000 | |||||||||||||||||||||
| Amortization of discount on lines of credit | 179,000 | 43,000 | |||||||||||||||||||||
| Accrued Interest Payable | 20,000 | 19,000 | |||||||||||||||||||||
| Credit Agreements amendment fee | 10,000 | ||||||||||||||||||||||
| Annual commitment fee | 120,000 | ||||||||||||||||||||||
| Total commitment fees paid | 240,000 | ||||||||||||||||||||||
| Additional commitment fees and legal costs incurred | 67,000 | ||||||||||||||||||||||
| Warrants issued to purchase common stock | 80,000 | 100,000 | 100,000 | 101,694 | |||||||||||||||||||
| Warrants price of warrants | 2.83 | 2.00 | 2.00 | 1.77 | |||||||||||||||||||
| Reduced exercise price of warrants | $ 2.00 | $ 0.84 | |||||||||||||||||||||
| Expiration date of warrant shares if unexercised | May 24, 2017 | Sep. 06, 2018 | Nov. 08, 2018 | May 26, 2015 | |||||||||||||||||||
| Number of Comerica Bank warrants exercised | 80,000 | ||||||||||||||||||||||
| Fair value of warrants | 142,000 | 143,000 | 137,000 | ||||||||||||||||||||
| Net issuance of common stock due to exercise of warrants | 40,465 | ||||||||||||||||||||||
| Fair value warrants expected term | 5 years | 5 years | |||||||||||||||||||||
| Fair value warrants volatility rate | 105.32% | 102.65% | |||||||||||||||||||||
| Fair value warrants dividend per share | $ 0.00 | $ 0.00 | |||||||||||||||||||||
| Fair value warrants risk free interest rate | 1.77% | 1.42% | |||||||||||||||||||||
| Number of secured promissory notes issued | 2 | ||||||||||||||||||||||
| Promissory notes, aggregate principal amount | 3,000,000 | ||||||||||||||||||||||
| Promissory notes, percentage | 14.25% | ||||||||||||||||||||||
| Repayment of lines of credit and loan and security agreement | 32,104,000 | 14,963,000 | 2,600,000 | ||||||||||||||||||||
| Unregistered Stock Issued | 78,172 | ||||||||||||||||||||||
| Financed insurance premium | 197,000 | 379,000 | |||||||||||||||||||||
| Number of monthly insurance premium installments payable in 2013 | Nine | ||||||||||||||||||||||
| Interest Expense incurred for financed insurance premiums | $ 5,000 | $ 5,000 | $ 5,000 | ||||||||||||||||||||
| Financial insurance premiums interest rate | 2.90% | 3.00% | |||||||||||||||||||||