Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2012

Stockholders' Equity [Abstract]

Summary of restricted stock unit activity

	2012					2011				2010
				Weighted				Weighted				Weighted
	Number			Average		Number		Average		Number		Average
	of			Grant-Date		of		Grant-Date		of		Grant-Date
	Units			Fair Value		Units		Fair Value		Units		Fair Value
Units outstanding, beginning of year		1,096		$	4.76		50	$	4.24		50	$	4.24
Granted		713,148			5.40		1,046		4.78		—
Released		(97,007	)		5.30		—				—
Forfeited		(35,025	)		5.29		—				—
Units outstanding, end of year		582,212			5.42		1,096		4.76		50		4.24
Aggregate Intrinsic Value at Year End	$	5,204,975

Summary of the Company's stock options

	2012					2011					2010
				Weighted					Weighted					Weighted
	Number			Average		Number			Average		Number			Average
	of			Exercise		of			Exercise		of			Exercise
	Options			Price		Options			Price		Options			Price
Options outstanding, beginning of year		7,576,493		$	5.75		7,507,236		$	5.71		8,780,017		$	5.94
Granted under option exchange program		—					—			—		221,723			4.84
Granted		—					1,018,182			4.65		988,941			5.08
Exercised		(784,383	)		2.46		(539,923	)		2.64		(502,205	)		1.99
Expired / terminated		(471,034	)		7.15		(409,002	)		6.38		(1,517,934	)		7.28
Cancelled under option exchange program		—			—		—			—		(463,306	)		11.66
Options outstanding, end of year		6,321,076			6.05		7,576,493			5.75		7,507,236			5.71
Options exercisable, end of year		5,278,243			6.31		6,432,667			6.02		5,967,590			5.99
Options expected to vest, end of year		841,249			4.62

Summary of stock options outstanding and exercisable

	Options Outstanding						Options Exercisable
					Weighted						Weighted
			Weighted		Average				Weighted		Average
	Number of		Average		Remaining		Number of		Average		Remaining
Range of	Options		Exercise		Contractual		Options		Exercise		Contractual
Exercise Price	Outstanding		Price		Life (Years)		Exercisable		Price		Life (Years)
$0.28—$0.99		209,602	$	0.41		0.3		209,602	$	0.41		0.3
$1.03—$2.41		106,444		2.37		0.7		106,444		2.37		0.7
$3.53—$9.93		5,555,961		5.81		5.4		4,513,128		6.06		5.0
$10.07—$19.76		425,569		11.99		3.4		425,569		11.99		3.4
$20.12—$29.98		23,500		23.02		1.4		23,500		23.02		1.4
$0.28—$29.98		6,321,076		6.05		5.0		5,278,243		6.31		4.5

Reported share-based compensation

	2012		2011		2010
Indirect manufacturing expense	$	172,360	$	121,177	$	300,787
Sales, general and administrative expenses		2,645,827		2,291,339		2,728,360
Research and development expenses		603,319		625,784		653,528
Total stock-based compensation	$	3,421,506	$	3,038,300	$	3,682,675