Income Taxes - Components of Deferred Tax Assets (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
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