Accrued Liabilities (Details)	3 Months Ended
	Mar. 31, 2016 USD ($) ft²	Dec. 31, 2015 USD ($) ft²	Sep. 30, 2013 USD ($) ft²	Dec. 31, 2014 USD ($)
Accrued Liabilities [Abstract]
Accrued salaries, bonus, and benefits	$ 2,266,158	$ 3,053,012
Accrued rent	1,263,383	1,361,379
Accrued licenses and maintenance fees	660,781	666,373
Accrued interest	493,876	494,703
Accrued warranties	302,362	316,835		$ 364,548
Accrued taxes	335,102	324,226
Other	194,166	117,465
Total accrued liabilities	5,515,828	6,333,993
Less: Long term accrued liabilities	(270,433)	(275,603)
Total current accrued liabilities	$ 5,245,395	$ 6,058,390
Square feet of office leased space | ft²	52,000	3,152
Square feet of demonstration and assembly leased space | ft²	12,000
Square feet of terminated unimproved leased space | ft²			13,000
Accrued lease termination costs			$ 515,138
Accrued lease termination costs remaining	$ 258,995
Sublease expiration date	Dec. 31, 2018