Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Summary of Significant Accounting Policies [Abstract]

Activity of allowance for doubtful accounts

	Year ended December 31,
	2012			2011
	(in thousands)
Beginning balance	$	378		$	194
Charges to costs and expenses		(54	)		1,873
Accounts charged off, less recoveries		(38	)		(1,689	)
Ending balance	$	286		$	378

Inventories

	As of December 31,
	2012		2011
	(in thousands)
Raw materials	$	21,267	$	7,835
Work in progress		20,787		9,776
Finished goods		5,300		5,212
	$	47,354	$	22,823

Property and equipment

	As of December 31,
	2012			2011
	(in thousands)
Land and land improvements	$	4,133		$	2,540
Buildings		30,364			26,915
Machinery, equipment and tooling		103,477			98,276
Leasehold improvements		7,696			7,712
Furniture and fixtures		941			834
Information systems		1,070			954
Construction in progress		17,712			17,530
Total cost		165,393			154,761
Accumulated depreciation and amortization		(45,543	)		(33,830	)
Property and equipment, net	$	119,850		$	120,931

Property and equipment, Estimated useful lives

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

	Year ended December 31,
	2012			2011
	(in thousands)
Balance, beginning of period	$	253		$	98
Charged to cost of sales		(37	)		241
Actual product warranty expenditures		(115	)		(86	)
Balance, end of period	$	101		$	253

Components of comprehensive income (loss)

	Year Ended December 31,
	2012			2011
	(in thousands)
Unrealized gain (loss) on investments, net of tax		457			(48	)
Unrealized (loss) on currency translation		(10	)		(2	)
Ending Balance	$	447		$	(50	)

Anti-dilutive securities excluded from calculation of diluted net loss per share

	2012
Warrants		143,291
Stock options		266,020
		409,311