Unaudited Quarterly Financial Data (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Unaudited Quarterly Financial Data
Product revenue	$ 12,169,000	$ 12,595,000	$ 12,579,000	$ 3,162,000	$ 5,658,000	$ 2,535,000	$ 5,581,000	$ 4,672,000	$ 40,504,929	$ 18,446,082	$ 20,791,874
Service Revenue	8,410,000	6,915,000	4,415,000	2,066,000	2,107,000	1,630,000	1,549,000	1,373,000	1,918,731	1,496,530	1,701,330
Service revenue	874,000	371,000	328,000	346,000	267,000	462,000	368,000	400,000	21,806,224	6,658,816	3,615,253
Net loss attributable to common shareholders	$ (7,183,000)	$ (9,377,000)	$ 3,825,000	$ (75,909,000)	$ (28,929,000)	$ (15,948,000)	$ (9,338,000)	$ (8,576,000)	$ (88,643,700)	$ (62,790,800)	$ (31,862,454)
Basic and diluted (in dollars per share)	$ (0.04)	$ (0.06)	$ 0.02	$ (0.57)	$ (0.28)	$ (0.19)	$ (0.14)	$ (0.18)	$ (0.56)	$ (0.82)	$ (0.93)