PROPERTY AND EQUIPMENT (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property and Equipment
Property and equipment, gross	$ 31,532	$ 23,118
Less: accumulated depreciation and amortization	(17,896)	(11,646)
Property and equipment, net	13,636	11,472
Computer hardware
Property and Equipment
Property and equipment, gross	11,167	7,451
Computer software
Property and Equipment
Property and equipment, gross	4,070	2,396
Machinery, equipment and tooling
Property and Equipment
Property and equipment, gross	10,800	8,718
Furniture and fixtures
Property and Equipment
Property and equipment, gross	1,584	1,572
Leasehold improvements
Property and Equipment
Property and equipment, gross	$ 3,911	$ 2,981