Statements Of Operations (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenue:
Systems	$ 19,672,983	$ 15,585,538	$ 31,120,034
Disposables, service and accessories	26,889,451	26,401,894	22,931,203
Total revenue	46,562,434	41,987,432	54,051,237
Cost of revenue:
Systems	9,905,528	8,576,283	12,719,200
Disposables, service and accessories	4,875,527	3,921,798	2,845,487
Total cost of revenue	14,781,055	12,498,081	15,564,687
Gross margin	31,781,379	29,489,351	38,486,550
Operating expenses:
Research and development	8,405,086	12,886,488	12,244,163
Sales and marketing	20,607,999	31,635,415	30,178,818
General and administrative	13,394,556	16,908,656	15,022,689
Total operating expenses	42,407,641	61,430,559	57,445,670
Operating loss	(10,626,262)	(31,941,208)	(18,959,120)
Other income (expense)	8,265,507	3,416,383	2,060,346
Interest income	7,361	9,052	10,578
Interest expense	(6,885,033)	(3,515,402)	(3,035,291)
Net loss	$ (9,238,427)	$ (32,031,175)	$ (19,923,487)
Net earnings (loss) per common share:
Basic	$ (1.33)	$ (5.84)	$ (3.94)
Diluted	$ (1.33)	$ (5.84)	$ (3.94)
Weighted average shares used in computing net earnings (loss) per common share:
Basic	6,944,928	5,482,627	5,052,200
Diluted	6,944,928	5,482,627	5,052,200