Basis of Preparation (Details) - USD ($)	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Current [Abstract]
Investment in sales-type sublease - current	$ 858,000	$ 828,000
Long-term [Abstract]
Investment in sales-type sublease - net of current portion	984,000	1,421,000
Operating lease right-of-use asset	144,000	0
Total leased assets	1,986,000
Current [Abstract]
Obligations under finance lease - current portion	1,391,000	1,399,000
Operating lease right-of-use liability - current portion	34,000	0
Long-term [Abstract]
Obligations under finance lease - net of current portion	323,000	988,000
Operating lease right-of-use liability - net of current portion	125,000	$ 0
Total lease liabilities	1,873,000
Lease Cost [Abstract]
Net lease cost	0
Operating lease [Abstract]
2019	21,000
2020	43,000
2021	45,000
2022	46,000
2023	24,000
Total	179,000
Less amount representing interest	20,000
Present value of lease liabilities	$ 159,000
Discount rate	5.85%
Finance Lease [Abstract]
2019	$ 759,000
2020	923,000
2021	90,000
2022	0
2023	0
Total	1,772,000
Less amount representing interest	58,000
Present value of lease liabilities	$ 1,714,000
Discount rate	4.555%
Selling, General and Administrative Expenses [Member]
Lease Cost [Abstract]
Operating lease cost	$ 21,000
Interest Expense [Member]
Lease Cost [Abstract]
Finance lease cost, interest on lease liabilities	52,000
Interest Income - Sales-type Sublease [Member]
Lease Cost [Abstract]
Sublease income	$ 73,000