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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) (USD $) | Sep. 30, 2013 | Dec. 31, 2012
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Deferred tax assets: |  |
Net operating loss and tax credit carryforwards | $ 45,757,210 |
Capital loss carryforward | 395,844 |
Accrued expenses | 64,406 |
Deferred revenue | 1,020,246 |
Reserve for accounts receivable | 2,078,681 |
Reserve for inventory | 133,608 |
Start-up costs | 110,118 |
Excess of book over tax depreciation | 1,304,151 |
Stock option and restricted stock award expense | 1,942,747 |
Investment in unconsolidated entity | 3,800,697 |
Less: valuation allowance | (56,412,435) | (57,901,529)
Deferred tax assets | 195,273 |
Deferred tax liability: |  |
Property and equipment basis | 124,044 |
Prepaid expenses | 71,229 |
Deferred tax liabilities | 195,273 |
Net deferred tax asset | $ 0 |

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