Property, plant and equipment, net and construction in progress (Details) - USD ($)	6 Months Ended
	Jun. 30, 2016		Jun. 30, 2015	Dec. 31, 2015
Property, plant and equipment, net and construction in progress [Abstract]
Construction in progress	$ 1,600,000
Property, plant and equipment, net	4,062,000			$ 7,539,000
Depreciation expense	748,000		$ 512,000
Reimbursement from landlord on construction in progress	411,000		560,000
Property, Plant and Equipment [Member]
Property, plant and equipment, net and construction in progress [Abstract]
Property, plant and equipment	6,492,000	[1]		10,757,000
Construction in progress	0	[1]		93,000
Accumulated depreciation	(2,430,000)	[1]		(3,311,000)
Property, plant and equipment, net	4,062,000	[1]		$ 7,539,000
Construction in Progress [Member]
Property, plant and equipment, net and construction in progress [Abstract]
Depreciation expense	748,000		$ 512,000
Tenant improvement allowance under lease agreement	1,400,000
Reimbursement from landlord on construction in progress	$ 200,000

[1] Reflects the effect of the Deconsolidation.