Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Schedule of Property and Equipment

Depreciation and amortization periods for the Company’s property, plant and equipment are as follows: 

	Useful Life
Machinery and equipment	4-7 years
Leasehold improvements	Shorter of expected useful life or lease term
Purchased computer software	4 years
Build-to-suit property	30 years

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

	December 31,
	2017			2016
Machinery and equipment	$	9,078		$	9,629
Leasehold improvements	579			2,769
Purchased computer software	1,316			363
Build-to-suit property	51,760			51,359
	62,733			64,120
Less: accumulated depreciation and amortization	(7,743		)	(7,668		)
Property and equipment, net	$	54,990		$	56,452