Summary of Significant Accounting Policies (Details 2) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Summary Of Significant Accounting Policies [Line Items]
Total cost	$ 12,072	$ 24,346
Accumulated depreciation and amortization	(10,765)	(17,236)
Property and equipment, net	1,307	7,110
Machinery, equipment and tooling [Member]
Summary Of Significant Accounting Policies [Line Items]
Total cost	6,352	17,769
Leasehold improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Total cost	4,624	4,624
Furniture and fixtures [Member]
Summary Of Significant Accounting Policies [Line Items]
Total cost	8	699
Information systems [Member]
Summary Of Significant Accounting Policies [Line Items]
Total cost	841	991
Construction in progress [Member]
Summary Of Significant Accounting Policies [Line Items]
Total cost	$ 247	$ 263