Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Property, Plant and Equipment

Machinery, equipment, furniture and fixtures	5 years
Software, computer hardware and manufacturing test fixtures	3 years
Engineering demonstration products and samples	1 year
Leasehold improvements	Lesser of the lease term or estimated useful lives

Property and equipment consisted of the following (in thousands):

	December 31, 2017			December 31, 2016
Manufacturing equipment	$	15,456		$	24,982
Office equipment and software	18,455			23,090
Leasehold improvements	2,838			2,964
Property and equipment, gross	36,749			51,036
Less: accumulated depreciation and amortization	(32,021		)	(44,323		)
Property and equipment, net	$	4,728		$	6,713