Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 22,988,000	$ 21,007,000
Deferred revenue	4,717,000	4,629,000
Stock-based compensation	732,000	839,000
Federal research and development tax credits	1,058,000	1,058,000
Intangibles, amortization	938,000	973,000
Inventories	149,000	175,000
Acquisition related expenses	318,000	321,000
Bad debt reserve	62,000	30,000
Other deductible temporary differences	487,000	556,000
Total gross deferred tax assets	31,449,000	29,588,000
Less: Valuation allowance	(27,568,000)	(26,112,000)
Deferred Tax Assets, Net of Valuation Allowance	3,881,000	3,476,000
Deferred expenses	(3,153,000)	(2,978,000)
Goodwill amortization	(395,000)	(298,000)
Fixed assets, depreciation	(333,000)	(200,000)
Deferred Tax Liabilities, Net, Current	(3,881,000)	(3,476,000)
Net deferred tax assets