Summary of Significant Accounting Policies (Details 2) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Summary of Significant Accounting Policies [Line Items]
Total cost	$ 14,748	$ 24,346
Accumulated depreciation and amortization	(12,262)	(17,236)
Property and equipment, net	2,486	7,110
Machinery, equipment and tooling [Member]
Summary of Significant Accounting Policies [Line Items]
Total cost	8,723	17,769
Leasehold improvements [Member]
Summary of Significant Accounting Policies [Line Items]
Total cost	4,624	4,624
Information systems [Member]
Summary of Significant Accounting Policies [Line Items]
Total cost	878	991
Furniture and fixtures [Member]
Summary of Significant Accounting Policies [Line Items]
Total cost	260	699
Construction in progress [Member]
Summary of Significant Accounting Policies [Line Items]
Total cost	$ 263	$ 263