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Debt and Interest - Additional Information (Detail) (USD $)
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3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | |||||||||||
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Dec. 31, 2013
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Feb. 13, 2014
Israel Discount Bank of New York [Member]
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Sep. 30, 2014
IDB Promissory Note Payable [Member]
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Sep. 30, 2013
IDB Promissory Note Payable [Member]
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Sep. 30, 2014
IDB Promissory Note Payable [Member]
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Sep. 30, 2013
IDB Promissory Note Payable [Member]
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Sep. 30, 2014
IDB Promissory Note Payable [Member]
Minimum [Member]
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Sep. 30, 2014
Hercules Note Payable [Member]
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Sep. 30, 2013
Hercules Note Payable [Member]
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Jun. 30, 2013
Hercules Note Payable [Member]
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Sep. 30, 2014
Hercules Note Payable [Member]
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Sep. 30, 2013
Hercules Note Payable [Member]
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Feb. 13, 2014
Hercules Note Payable [Member]
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| Debt Instrument [Line Items] | |||||||||||||||||
| Long-term Debt, Gross | $ 14,000,000 | $ 14,000,000 | $ 13,200,000 | ||||||||||||||
| Debt Instrument, Periodic Payment | 14,000,000 | ||||||||||||||||
| Debt Instrument, Periodic Payment, Principal | 13,200,000 | ||||||||||||||||
| Debt Instrument Term Charges | 0 | 0 | 398,000 | 400,000 | 400,000 | ||||||||||||
| Debt Instrument, Fee Amount | 300,000 | 300,000 | |||||||||||||||
| Debt Instrument, Periodic Payment, Interest | 100,000 | ||||||||||||||||
| Debt Instrument, Annual Principal Payment | 500,000 | 500,000 | |||||||||||||||
| Debt Instrument, Face Amount | 15,000,000 | ||||||||||||||||
| Debt Instrument, Unused Borrowing Capacity, Amount | 100,000 | ||||||||||||||||
| Interest Expense, Debt | 121,000 | 493,000 | 1,200,000 | 1,500,000 | 0 | 454,000 | 845,000 | 1,300,000 | |||||||||
| Accretion of Discount | 0 | 99,000 | 435,000 | 286,000 | |||||||||||||
| Amortization of Debt Discount (Premium) | $ 201,000 | $ 3,000 | $ 81,000 | $ 0 | $ 0 | $ 5,000 | $ 43,000 | $ 15,000 | |||||||||
| Debt Instrument, Maturity Date | Feb. 13, 2016 | ||||||||||||||||
| Debt Instrument, Interest Rate Terms | unpaid principal amount of each advance shall bear interest at a rate per annum equal to the rate payable on the Company’s money market account of 0.75% plus a margin of 150 basis points. | ||||||||||||||||