Summary of Significant Accounting Policies (Details 2) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Summary Of Significant Accounting Policies [Line Items]
Total cost	$ 10,020	$ 11,556
Accumulated depreciation and amortization	(7,247)	(10,741)
Property and equipment, net	2,773	815
Leasehold improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Total cost	3,620	4,624
Machinery, equipment and tooling [Member]
Summary Of Significant Accounting Policies [Line Items]
Total cost	3,293	6,105
Buildings [Member]
Summary Of Significant Accounting Policies [Line Items]
Total cost	1,686
Information systems [Member]
Summary Of Significant Accounting Policies [Line Items]
Total cost	819	819
Land and land improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Total cost	594
Furniture and fixtures [Member]
Summary Of Significant Accounting Policies [Line Items]
Total cost	$ 8	$ 8