Stockholders' Equity (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2014
Stock Options Outstanding
Number of Shares	2,677,774
Weighted Average Remaining Contractual Life	5 years 7 months 6 days
Weighted Average Exercise Price (in dollars per share)	$ 4.24
Stock Options Exercisable
Number of Shares	1,172,747
Weighted Average Exercise Price Per Share (in dollars per share)	$ 3.93
Exercise Price Range From Dollars 0.50 To 1.85 [Member]
Stock options outstanding and exercisable by exercise price
Exercise Price, low end of range (in dollars per share)	$ 0.50
Exercise Price, high end of range (in dollars per share)	$ 1.85
Stock Options Outstanding
Number of Shares	537,787
Weighted Average Remaining Contractual Life	4 years 8 months 5 days
Weighted Average Exercise Price (in dollars per share)	$ 1.29
Stock Options Exercisable
Number of Shares	351,235
Weighted Average Exercise Price Per Share (in dollars per share)	$ 1.12
Exercise Price Range From Dollars 1.87 To 4.74 [Member]
Stock options outstanding and exercisable by exercise price
Exercise Price, low end of range (in dollars per share)	$ 1.87
Exercise Price, high end of range (in dollars per share)	$ 4.74
Stock Options Outstanding
Number of Shares	644,987
Weighted Average Remaining Contractual Life	6 years 18 days
Weighted Average Exercise Price (in dollars per share)	$ 3.41
Stock Options Exercisable
Number of Shares	255,641
Weighted Average Exercise Price Per Share (in dollars per share)	$ 3.68
Exercise Price Range From Dollars 5.25 To 5.41 [Member]
Stock options outstanding and exercisable by exercise price
Exercise Price, low end of range (in dollars per share)	$ 5.25
Exercise Price, high end of range (in dollars per share)	$ 5.41
Stock Options Outstanding
Number of Shares	755,000
Weighted Average Remaining Contractual Life	5 years 3 months 18 days
Weighted Average Exercise Price (in dollars per share)	$ 5.39
Stock Options Exercisable
Number of Shares	177,391
Weighted Average Exercise Price Per Share (in dollars per share)	$ 5.38
Exercise Price Range From Dollars 5.57 To 6.00 [Member]
Stock options outstanding and exercisable by exercise price
Exercise Price, low end of range (in dollars per share)	$ 5.57
Exercise Price, high end of range (in dollars per share)	$ 6.00
Stock Options Outstanding
Number of Shares	710,000
Weighted Average Remaining Contractual Life	6 years 1 month 6 days
Weighted Average Exercise Price (in dollars per share)	$ 5.93
Stock Options Exercisable
Number of Shares	374,730
Weighted Average Exercise Price Per Share (in dollars per share)	$ 5.95