Stockholders' Equity (Details 2) (USD $)	1 Months Ended	12 Months Ended
	Apr. 30, 2004	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stockholders Equity
Maximum number of shares authorized for grant	1,500,000
Number of shares available for grant		500,824
Restricted stock
Stockholders Equity
Vesting rights percentage each year beginning on the second anniversary date of the grant	20.00%
Service period over which the aggregate market value of stock is being amortized	6 years	6 years
Number of Shares
Nonvested at the beginning of the period (in shares)		594,400
Granted (in shares)		148,000
Vested (in shares)		(129,000)
Forfeited (in shares)		(39,400)
Nonvested at the end of the period (in shares)		574,000	594,400
Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)		$ 2.66
Granted (in dollars per share)		$ 1.04	$ 1.78	$ 2.09
Vested (in dollars per share)		$ 3.67
Forfeited (in dollars per share)		$ 2.25
Nonvested at the end of the period (in dollars per share)		$ 2.04	$ 2.66
Additional disclosure
Total fair value of shares vested during the period (in dollars)		$ 474,000	$ 547,000	$ 556,000
Compensation expense (in dollars)		313,000	407,000	662,000
Total unrecognized compensation cost (in dollars)		568,000
Weighted-average period for recognition of total unrecognized compensation cost		3 years 2 months 12 days
Stock Options
Stockholders Equity
Total fair value of stock options vested during the period (in dollars)				$ 1,000