Statements Of Operations (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenue:
Systems	$ 3,863,107	$ 5,024,543	$ 9,042,612	$ 9,312,719
Disposables, service and accessories	6,649,791	6,577,596	13,753,514	12,514,124
Total revenue	10,512,898	11,602,139	22,796,126	21,826,843
Cost of revenue:
Systems	2,175,971	2,520,431	4,518,381	4,704,909
Disposables, service and accessories	1,084,107	995,915	2,503,528	1,816,416
Total cost of revenue	3,260,078	3,516,346	7,021,909	6,521,325
Gross margin	7,252,820	8,085,793	15,774,217	15,305,518
Operating expenses:
Research and development	2,196,073	3,311,177	5,021,280	6,705,436
Sales and marketing	6,223,330	9,712,519	12,222,069	18,050,855
General and administrative	3,469,346	4,606,555	7,342,219	8,856,824
Total operating expenses	11,888,749	17,630,251	24,585,568	33,613,115
Operating loss	(4,635,929)	(9,544,458)	(8,811,351)	(18,307,597)
Other income (expense)	9,269,424	620,409	9,081,354	640,755
Interest income	2,008	2,133	3,371	5,320
Interest expense	(1,829,076)	(772,769)	(3,279,859)	(1,583,096)
Net loss	$ 2,806,427	$ (9,694,685)	$ (3,006,485)	$ (19,244,618)
Net earnings (loss) per common share:
Basic	$ 0.42	$ (1.77)	$ (0.49)	$ (3.51)
Diluted	$ 0.32	$ (1.77)	$ (0.49)	$ (3.51)
Weighted average shares used in computing net earnings (loss) per common share:
Basic	6,741,578	5,478,087	6,120,447	5,475,044
Diluted	9,263,149	5,478,087	6,120,447	5,475,044