Property and Equipment, Net (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation (including for equipment and furniture under capital lease of $2,961 and $2,218 at December 31, 2016 and 2015, respectively)	$ (7,895,000)	$ (6,901,000)
Property and equipment, net	4,356,000	6,001,000
Accumulated depreciation on capitalized leased assets	2,961,000	2,218,000
Depreciation and amortization expense	2,700,000	2,300,000	$ 2,300,000
Impairment of long-lived assets	0	0	0
Losses on disposal of property and equipment	200,000	0	$ 0
Equipment [Member]
Property, Plant and Equipment, Net [Abstract]
Property and Equipment	11,317,000	11,599,000
Capitalized leased assets	6,087,000	6,199,000
Furniture and Fixtures [Member]
Property, Plant and Equipment, Net [Abstract]
Property and Equipment	205,000	484,000
Capitalized leased assets	0	143,000
Leasehold Improvements [Member]
Property, Plant and Equipment, Net [Abstract]
Property and Equipment	$ 729,000	$ 819,000