Equity Transactions (Details) (USD $)	12 Months Ended			12 Months Ended				1 Months Ended	0 Months Ended		12 Months Ended			12 Months Ended			1 Months Ended	3 Months Ended	0 Months Ended	1 Months Ended		12 Months Ended		1 Months Ended		6 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012 Warrants	Dec. 31, 2011 Warrants	Dec. 31, 2012 Warrants Exercise Price $0.51 - $1.00	Dec. 31, 2012 Warrants Exercise price $1.01 - $5.00	Dec. 31, 2012 Warrants Exercise Price $5.01 - $7.00	Dec. 31, 2012 Warrants Exercise Price $7.01 - $105.00	Jan. 31, 2012 Consultant	May 15, 2012 Chairman	Dec. 07, 2012 Chairman Warrants	Dec. 31, 2011 Stock options	Dec. 31, 2010 Stock options	Dec. 31, 2012 Stock options	Dec. 31, 2012 Restricted stock	Dec. 31, 2011 Restricted stock	Dec. 31, 2010 Restricted stock Executive officers	Jan. 31, 2012 Restricted stock Senior employees item	Mar. 31, 2011 Restricted stock Senior employees item	Jun. 03, 2010 Non-Employee Directors' Stock Plan	Dec. 31, 2010 Non-Employee Directors' Stock Plan Restricted stock Outside director item	Jun. 30, 2010 Non-Employee Directors' Stock Plan Restricted stock Outside director item	Dec. 31, 2012 Non-Employee Directors' Stock Plan Restricted stock Outside director item	Dec. 31, 2011 Non-Employee Directors' Stock Plan Restricted stock Outside director item	Jul. 31, 2012 Employee Stock Purchase Plan	Jan. 31, 2012 Employee Stock Purchase Plan	Jun. 30, 2012 Employee Stock Purchase Plan	Dec. 31, 2012 Employee Stock Purchase Plan	Dec. 31, 2011 Employee Stock Purchase Plan	Dec. 31, 2010 Employee Stock Purchase Plan	Dec. 31, 2012 Employee Recognition Program item	Dec. 31, 2011 Employee Recognition Program item	Dec. 31, 2010 Employee Recognition Program
Equity Transactions
Number of shares purchased on exercise of stock options											53,949	15,061
Number of shares exercised on cashless basis											36,378
Number of shares exchanged on exercise of options on cashless basis											28,213	9,626
Shares issued as a result of exercise of options exercised on a cash and cashless basis											25,736	5,435
Shares issued									1,000,000																					90	230	250
Shares issued																								47,067	25,905		72,793		49,739
Shares granted														130,020	154,478	80,552	66,966	108,025			18,359	61,094	46,453
Number of directors to whom shares are granted																					5	5	7
Shares that vest at the grant date (as a percent)																			50.00%		50.00%	50.00%	50.00%
Shares that vest after one year of the grant date (as a percent)																			0.50		0.50	0.50	0.50
Shares forfeited														18,319						2,825
Number of directors who resigned from board																				1
Value of shares issued	$ 2,490,000
Amount received on issuance of shares																										91,000	170,599	80,000	145,000
Number of employees to whom shares are issued																	9	8												2	10
Shares issued as compensation for services								6,135
Closing bid price (in dollars per share)									$ 2.55				$ 0.58
Warrants
Warrant issued to purchase shares of common stock (in shares)										275,000
Exercise price of warrant to purchase shares of common stock (in dollars per share)		$ 0.77		$ 0.66	$ 4.67	$ 6.40	$ 105.00			$ 0.51
Amount of letter of credit issued to support issuance of surety bonds										$ 1,000,000
Warrants Outstanding
Range of exercise price, lower limit (in dollars per share)				$ 0.51	$ 1.01	$ 5.01	$ 7.01
Range of exercise price, upper limit (in dollars per share)				$ 1.00	$ 5.00	$ 7.00	$ 105.00
Number Outstanding (in shares)		4,880,403	135,853	4,789,927	15,000	75,000	476
Weighted Average Remaining Contractual Life		4 years 7 months 6 days		4 years 8 months 12 days	2 years	7 months 6 days	2 years 3 months 18 days
Weighted Average Exercise Price (in dollars per share)		$ 0.77		$ 0.66	$ 4.67	$ 6.40	$ 105.00			$ 0.51