Property and Equipment - Summarized Category of Fixed Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, plant & equipment, gross	$ 5,575	$ 4,762
Less Accumulated Depreciations	(1,685)	(1,739)
Total property, plant & equipment, net	3,890	3,023
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant & equipment, gross	1,354	272
Computer Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Property, plant & equipment, gross	344	227
Office Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant & equipment, gross	110	110
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant & equipment, gross	9	9
Idle Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant & equipment, gross	$ 3,758	$ 4,144