Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

Accounting Policies [Abstract]

Summary of Company's Restricted Cash

A summary of the Company’s restricted cash at December 31, 2016 and 2015 is as follows:

	As of December 31,
	2016		2015
	(in thousands)
Certificates of deposit	$	5	$	5
Flexible spending funds		2		2
Fixed deposit pledge		156		163
	$	163	$	170

Activity of Allowance for Doubtful Accounts

The following table shows the activity of the allowance for doubtful accounts:

	Year ended December 31,
	2016			2015
	(in thousands)
Beginning balance	$	389		$	140
Charges to costs and expenses		(235	)		235
Accounts write offs, less recoveries		(123	)		14
Ending balance	$	31		$	389

Inventories

Inventories are composed of the following:

	As of December 31,
	2016		2015
	(in thousands)
Raw materials	$	3,112	$	7,346
Work-in-process		4,251		9,920
Finished goods		637		4,067
	$	8,000	$	21,333

Property and Equipment

Property and equipment consisted of the following:

	As of December 31,
	2016			2015
	(in thousands)
Land and land improvements	$	—		$	4,133
Buildings		—			26,097
Machinery, equipment and tooling		17,769			50,364
Leasehold improvements		4,624			7,141
Information systems		991			1,105
Furniture and fixtures		699			816
Construction in progress		263			1,327
Total cost		24,346			90,983
Accumulated depreciation and amortization		(17,236	)		(33,414	)
Property and equipment, net	$	7,110		$	57,569

Property and Equipment, Estimated Useful Lives

The estimated useful lives are as follows:

Asset description	Life
Buildings	39 years
Machinery, equipment and tooling	3-10 years
Leasehold improvements	Lesser of life of lease or economic life
Furniture and fixtures	7 years
Information systems	3 years

Product Warranty Liability

The following table presents changes in the Company’s product warranty liability:

	Year ended December 31,
	2016			2015
	(in thousands)
Balance, beginning of period	$	73		$	97
Charged to cost of sales		(1	)		90
Actual product warranty expenditures		(45	)		(114	)
Balance, end of period	$	27		$	73

Components of Comprehensive Loss

A summary of the components of comprehensive loss for the years ended December 31, 2016 and 2015 follows:

	Year Ended December 31,
	2016			2015
	(in thousands)
Reclassification of unrealized gain included in net loss	$	—		$	—
Unrealized loss on investments, net of tax		(12	)		(17	)
Unrealized loss on currency translation		(18	)		(16	)
Ending balance	$	(30	)	$	(33	)