Stock Options, Stock Purchase Plan and Warrants (Tables)

12 Months Ended

Dec. 31, 2012

Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]

Fair value of each stock option award granted

	2012			2011
Expected term (in years)		3.7			3.6
Risk-free interest rate (%)		0.6	%		1.18	%
Expected volatility (%)		51	%		55	%
Dividend yield (%)		0	%		0	%
Weighted average fair value/share at grant date	$	0.73		$	0.51

Status of our stock options and stock awards

	Number Of Shares			Weighted Average Exercise Price
Outstanding at December 31, 2010		5,470,044		$	0.87
Granted		519,000			1.39
Exercised		(382,500	)		0.95
Canceled		(827,374	)		1.15
Outstanding at December 31, 2011		4,779,170			0.87
Granted		1,298,000			1.64
Exercised		(197,209	)		1.02
Canceled		(102,747	)		1.60
Outstanding at December 31, 2012		5,777,214			1.02
Exercisable at December 31, 2012		4,074,834		$	0.79

Summarizes information about our options outstanding

	Options Outstanding						Options Exercisable
Range of Exercise Prices ($)	Number Outstanding		Weighted Average Remaining Contractual Life (Years)		Weighted Average Exercise Price		Number Exercisable		Weighted Average Remaining Contractual Life (Years)		Weighted Average Exercise Price
0.00 – 0.30		975,000		1.9	$	0.25		975,000		1.9	$	0.25
0.31 – 0.46		5,000		3.2		0.31		5,000		3.2		0.31
0.47 – 0.61		101,500		3.3		0.50		101,500		3.3		0.50
0.62 – 0.83		1,988,674		2.9		0.77		1,973,922		2.9		0.77
0.84 – 1.08		254,497		1.9		1.03		216,622		1.8		1.03
1.09 – 1.47		1,111,918		3.5		1.42		511,790		3.3		1.43
1.48 – 1.84		1,340,625		3.7		1.67		291,000		2.7		1.58
		5,777,214		3.0	$	1.02		4,074,834		2.6	$	0.79

Valuation of option items under trinomial lattice model

Expected term in years	3.8
Risk-free interest rate (%)	0.4	%
Weighted average expected volatility (%)	53	%
Dividend yield (%)	0	%

Warrants issued to members of board of directors

Type of Exercise	Warrant Shares		Exercise Price / Share		Cash Received		Common Stock Shares Issued
For cash		175,000	$	1.50	$	262,500		175,000
Cashless net exercise		725,000	$	1.50	$	—		75,066
Expired unexercised		98,417	$	1.50	$	—		—

Warrant activity is summarized

	Shares			Weighted Average Exercise Price
Warrants outstanding, December 31, 2010		6,326,750			0.65
Granted		—			—
Exercised		(4,170,000	)		0.29
Expired		—			—
Cancelled		—			—
Warrants outstanding, December 31, 2011		2,156,750			1.34
Granted		200,000			1.43
Exercised		(900,000	)		1.50
Expired		(98,417	)		1.50
Cancelled		—			—
Warrants outstanding, December 31, 2012		1,358,333		$	1.24

Summarizes information on warrants outstanding

Number outstanding		Exercise price		Issued		Expire
	83,333	$	0.75		02/09/2009		02/08/2014
	625,000	$	1.05		03/16/2009		03/15/2014
	450,000	$	1.50		5/3/2010		5/2/2017
	200,000	$	1.43		1/12/2012		1/12/2017
	1,358,333	$	1.24

Warrant [Member]

Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]

Valuation of option items under trinomial lattice model

Expected term in years	3.7
Risk-free interest rate (%)	0.5	%
Weighted average expected volatility (%)	52	%
Dividend yield (%)	0	%

Chief Executive Officer [Member]

Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]

Valuation of option items under trinomial lattice model

Expected term in years	3.8
Risk-free interest rate (%)	0.6	%
Weighted average expected volatility (%)	52	%
Dividend yield (%)	0	%