Stock-Based Compensation (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
Summary of options outstanding by exercise price range
Options Exercisable, Weighted Average Exercise Price	$ 3.14
Employee Stock Option [Member]
Summary of options outstanding by exercise price range
Options Outstanding, Number Outstanding at 12/31/14	1,709,400
Options Outstanding, Weighted Average Remaining Contractual Life (years)	4 years 6 months 15 days
Options Outstanding, Weighted Average Exercise Price	$ 4.92
Options Exercisable, Number Exercisable at 12/31/14	1,444,751
Options Exercisable, Weighted Average Exercise Price	$ 4.87
Employee Stock Option [Member] | Range One [Member]
Summary of options outstanding by exercise price range
Range of Exercise Price, Lower Range Limit	$ 2.08
Range of Exercise Price, Upper Range Limit	$ 3.50
Options Outstanding, Number Outstanding at 12/31/14	70,200
Options Outstanding, Weighted Average Remaining Contractual Life (years)	6 years 8 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 2.61
Options Exercisable, Number Exercisable at 12/31/14
Options Exercisable, Weighted Average Exercise Price
Employee Stock Option [Member] | Range Two [Member]
Summary of options outstanding by exercise price range
Range of Exercise Price, Lower Range Limit	$ 3.51
Range of Exercise Price, Upper Range Limit	$ 5.00
Options Outstanding, Number Outstanding at 12/31/14	1,221,000
Options Outstanding, Weighted Average Remaining Contractual Life (years)	4 years 3 months 29 days
Options Outstanding, Weighted Average Exercise Price	$ 4.24
Options Exercisable, Number Exercisable at 12/31/14	1,211,834
Options Exercisable, Weighted Average Exercise Price	$ 4.25
Employee Stock Option [Member] | Range Three [Member]
Summary of options outstanding by exercise price range
Range of Exercise Price, Lower Range Limit	$ 5.01
Range of Exercise Price, Upper Range Limit	$ 6.50
Options Outstanding, Number Outstanding at 12/31/14	245,000
Options Outstanding, Weighted Average Remaining Contractual Life (years)	5 years 6 months 26 days
Options Outstanding, Weighted Average Exercise Price	$ 5.90
Options Exercisable, Number Exercisable at 12/31/14	91,383
Options Exercisable, Weighted Average Exercise Price	$ 5.62
Employee Stock Option [Member] | Range Four [Member]
Summary of options outstanding by exercise price range
Range of Exercise Price, Lower Range Limit	$ 6.51
Range of Exercise Price, Upper Range Limit	$ 10.00
Options Outstanding, Number Outstanding at 12/31/14	170,000
Options Outstanding, Weighted Average Remaining Contractual Life (years)	3 years 9 months 15 days
Options Outstanding, Weighted Average Exercise Price	$ 7.83
Options Exercisable, Number Exercisable at 12/31/14	138,334
Options Exercisable, Weighted Average Exercise Price	$ 7.93
Employee Stock Option [Member] | Range Five [Member]
Summary of options outstanding by exercise price range
Range of Exercise Price, Lower Range Limit	$ 10.01
Range of Exercise Price, Upper Range Limit	$ 86.25
Options Outstanding, Number Outstanding at 12/31/14	3,200
Options Outstanding, Weighted Average Remaining Contractual Life (years)	4 days
Options Outstanding, Weighted Average Exercise Price	$ 86.25
Options Exercisable, Number Exercisable at 12/31/14	3,200
Options Exercisable, Weighted Average Exercise Price	$ 86.25