Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Summary of Company's Restricted Cash

A summary of the Company’s restricted cash at December 31, 2014 and 2013 is as follows:

	As of December 31,
	2014		2013
	(in thousands)
Certificates of deposit	$	5	$	5
Flexible spending funds		4		8
Fixed deposit pledge		174		152
	$	183	$	165

Activity of Allowance for Doubtful Accounts

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

	Year ended December 31,
	2014			2013
	(in thousands)
Beginning balance	$	50		$	286
Charges to costs and expenses		105			24
Accounts charged off, less recoveries		(15	)		(260	)
Ending balance	$	140		$	50

Inventories

Inventories are composed of the following:

	As of December 31,
	2014		2013
	(in thousands)
Raw materials	$	14,503	$	18,651
Work in progress		6,357		10,337
Finished goods		1,879		5,324
	$	22,739	$	34,312

Property and Equipment

Property and equipment consisted of the following:

	As of December 31,
	2014			2013
	(in thousands)
Land and land improvements	$	4,133		$	4,133
Buildings		32,482			32,269
Machinery, equipment and tooling		127,158			121,313
Leasehold improvements		7,640			7,696
Furniture and fixtures		961			949
Information systems		1,140			1,077
Construction in progress		3,734			5,221
Total cost		177,248			172,658
Accumulated depreciation and amortization		(69,572	)		(57,438	)
Property and equipment, net	$	107,676		$	115,220

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,
	2014			2013
	(in thousands)
Balance, beginning of period	$	141		$	101
Charged to cost of sales		407			102
Actual product warranty expenditures		(451	)		(62	)
Balance, end of period	$	97		$	141

Components of Comprehensive Income (Loss)

A summary of the components of comprehensive income (loss) for the years ended December 31, 2014 and 2013 follows:

	Year Ended December 31,
	2014			2013
	(in thousands)
Reclassification of unrealized gain included in net loss	$	388		$	—
Unrealized loss on investments, net of tax		(415	)		(406	)
Unrealized loss on currency translation		(16	)		(12	)
Ending Balance	$	(43	)	$	(418	)

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		2013
Warrants		46,290		179,252
Stock options		4,146		56,892
		50,436		236,144