Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2013

Summary of Significant Accounting Policies [Abstract]

Activity of allowance for doubtful accounts

	March 31, 2013			December 31, 2012
	(in thousands)
Beginning balance	$	286		$	378
Charges to costs and expenses		99			(54	)
Accounts charged off, less recoveries		(130	)		(38	)
Ending balance	$	255		$	286

Inventories

	March 31, 2013		December 31, 2012
	(in thousands)
Raw materials	$	21,111	$	21,267
Work in progress		23,950		20,787
Finished goods		4,474		5,300
	$	49,535	$	47,354

Property and equipment

	March 31, 2013			December 31, 2012
	(in thousands)
Land and land improvements	$	4,133		$	4,133
Buildings		30,389			30,364
Machinery, equipment and tooling		106,139			103,477
Leasehold improvements		7,696			7,696
Furniture and fixtures		941			941
Information systems		1,070			1,070
Construction in progress		15,217			17,712
Total cost		165,585			165,393
Accumulated depreciation and amortization		(48,653	)		(45,543	)
Property and equipment, net	$	116,932		$	119,850

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

	March 31, 2013		March 31, 2012
Warrants		114,093		172,886
Stock options		217,373		360,376
Total		331,466		533,262

Components of comprehensive income (loss)

	March 31, 2013			December 31, 2012
	(in thousands)
Unrealized gain (loss) on investments		(146	)		457
Unrealized (loss) on currency translation		(11	)		(10	)
Ending Balance	$	(157	)	$	447