Shares Authorized under Stock Option Plans, by Exercise Price Range (Details) (USD $)	9 Months Ended
	Sep. 30, 2014
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 1	$ 1
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 2	2
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 3	324,500
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 4	9.01
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 5	1.65
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 6	81,126
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 7	1.65
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 8	2
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 9	3
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 10	561,976
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 11	6.58
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 12	2.05
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 13	531,417
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 14	2.05
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 15	3
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 16	5
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 17	933,333
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 18	5.98
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 19	3.39
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 20	908,333
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 21	3.36
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 22	74
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 23	75
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 24	1,333
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 25	3.45
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 26	75.00
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 27	1,333
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 28	75.00
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 29	1,821,142
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 30	6.70
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 31	2.72
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 32	$ 1,522,209
Share-based Payments Shares Authorized Under Stock Option Plans, By Exercise Price Range 33	2.87