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Income Taxes - Components of Deferred Tax Assets (Details) - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
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Income Tax Disclosure [Abstract] |  |
Net operating loss carryforwards | $ 18,950,000 | $ 17,164,000
Stock-based compensation | 275,000 |
Reserves | 24,000 | $ 32,000
Deferred rent | 38,000 | 51,000
Research and development tax credits | 136,000 | 109,000
Total deferred tax assets | 19,423,000 | 17,356,000
Intangible assets | (698,000) | (1,108,000)
Depreciation | $ (83,000) | (140,000)
Other |  | (1,000)
Total deferred tax liabilities | $ (781,000) | (1,249,000)
Net deferred tax assets | 18,642,000 | 16,107,000
Less: Valuation allowance | $ (18,642,000) | $ (16,107,000)
Deferred tax assets, net of allowance |  |

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