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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) (USD $) | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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Deferred tax assets: |  |  |
Net operating loss and tax credit carryforwards | $ 42,412,630 |  |
Capital loss carryforward | 385,188 |  |
Accrued expenses | 62,672 |  |
Deferred revenue | 644,367 |  |
Reserve for accounts receivable | 2,048,105 |  |
Reserve for inventory return | 130,012 |  |
Stock option and restricted stock awards | 907,476 |  |
Start-up costs | 107,154 |  |
Excess of book over tax depreciation | 1,428,417 |  |
Investment - unconsolidated entity | 3,687,310 |  |
Less: valuation allowance | (51,625,159) | (57,901,529) | (52,515,797)
Deferred tax assets | 188,172 |  |
Deferred tax liability: |  |  |
Prepaid expenses | 118,860 |  |
Property and equipment basis | 69,312 |  |
Deferred tax liabilities | 188,172 |  |
Net deferred tax asset | $ 0 |  |

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