Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Summary of Company's Restricted Cash

A summary of the Company’s restricted cash at December 31, 2015 and 2014 is as follows:

	As of December 31,
	2015		2014
	(in thousands)
Certificates of deposit	$	5	$	5
Flexible spending funds		2		4
Fixed deposit pledge		163		174
	$	170	$	183

Activity of Allowance for Doubtful Accounts

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

	Year ended December 31,
	2015		2014
	(in thousands)
Beginning balance	$	140	$	50
Charges to costs and expenses		235		105
Accounts charged off, less recoveries		14		(15	)
Ending balance	$	389	$	140

Inventories

Inventories are composed of the following:

	As of December 31,
	2015		2014
	(in thousands)
Raw materials	$	7,346	$	14,503
Work in progress		9,920		6,357
Finished goods		4,067		1,879
	$	21,333	$	22,739

Property and Equipment

Property and equipment consisted of the following:

	As of December 31,
	2015			2014
	(in thousands)
Land and land improvements	$	4,133		$	4,133
Buildings		26,097			32,482
Machinery, equipment and tooling		50,364			127,158
Leasehold improvements		7,141			7,640
Furniture and fixtures		816			961
Information systems		1,105			1,140
Construction in progress		1,327			3,734
Total cost		90,983			177,248
Accumulated depreciation and amortization		(33,414	)		(69,572	)
Property and equipment, net	$	57,569		$	107,676

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,
	2015			2014
	(in thousands)
Balance, beginning of period	$	97		$	141
Charged to cost of sales		90			407
Actual product warranty expenditures		(114	)		(451	)
Balance, end of period	$	73		$	97

Components of Comprehensive Loss

 A summary of the components of comprehensive loss for the years ended December 31, 2015 and 2014 follows:

	Year Ended December 31,
	2015			2014
	(in thousands)
Reclassification of unrealized gain included in net loss	$	—		$	388
Unrealized loss on investments, net of tax		(17	)		(415	)
Unrealized loss on currency translation		(16	)		(16	)
Ending Balance	$	(33	)	$	(43	)

Anti-Dilutive Securities Excluded from Calculation of Diluted Net Loss Per Share

The number of anti-dilutive shares excluded from the calculation of diluted net loss per share is as follows as of December 31, 2014:

	2014
Warrants		46,290
Stock options		4,146
		50,436