Statements Of Operations (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue:
Systems	$ 7,839,006	$ 12,743,218	$ 19,672,983
Disposables, service and accessories	27,172,270	25,287,863	26,889,451
Total revenue	35,011,276	38,031,081	46,562,434
Cost of revenue:
Systems	4,204,719	6,870,954	9,905,528
Disposables, service and accessories	4,018,661	4,130,347	4,875,527
Total cost of revenue	8,223,380	11,001,301	14,781,055
Gross margin	26,787,896	27,029,780	31,781,379
Operating expenses:
Research and development	5,158,331	5,672,058	8,405,086
Sales and marketing	15,168,940	17,132,093	20,607,999
General and administrative	11,845,289	13,066,103	13,394,556
Total operating expenses	32,172,560	35,870,254	42,407,641
Operating loss	(5,384,664)	(8,840,474)	(10,626,262)
Other income (expense)	3,510,439	(47,349,378)	8,265,507
Interest income	7,084	5,800	7,361
Interest expense	(3,335,300)	(12,573,537)	(6,885,033)
Net loss	$ (5,202,441)	$ (68,757,589)	$ (9,238,427)
Net loss per common share:
Basic	$ (0.26)	$ (5.95)	$ (1.33)
Diluted	$ (0.26)	$ (5.95)	$ (1.33)
Weighted average shares used in computing net loss per common share:
Basic	19,945,038	11,554,566	6,944,928
Diluted	19,945,038	11,554,566	6,944,928