Statements Of Operations (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenue:
Systems	$ 3,323,251	$ 3,863,107	$ 5,551,328	$ 9,042,612
Disposables, service and accessories	6,410,156	6,649,791	12,590,284	13,753,514
Total revenue	9,733,407	10,512,898	18,141,612	22,796,126
Cost of revenue:
Systems	1,602,480	2,175,971	2,793,833	4,518,381
Disposables, service and accessories	869,408	1,084,107	1,870,701	2,503,528
Total cost of revenue	2,471,888	3,260,078	4,664,534	7,021,909
Gross margin	7,261,519	7,252,820	13,477,078	15,774,217
Operating expenses:
Research and development	1,484,096	2,196,073	3,013,303	5,021,280
Sales and marketing	4,254,546	6,223,330	9,110,560	12,222,069
General and administrative	3,276,967	3,469,346	6,700,708	7,342,219
Total operating expenses	9,015,609	11,888,749	18,824,571	24,585,568
Operating loss	(1,754,090)	(4,635,929)	(5,347,493)	(8,811,351)
Other income	893,642	9,269,424	1,499,744	9,081,354
Interest income	1,256	2,008	2,668	3,371
Interest expense	(2,147,600)	(1,829,076)	(4,081,858)	(3,279,859)
Net income (loss)	$ (3,006,792)	$ 2,806,427	$ (7,926,939)	$ (3,006,485)
Net earnings (loss) per common share:
Basic	$ (0.37)	$ 0.42	$ (0.98)	$ (0.49)
Diluted	$ (0.37)	$ 0.32	$ (0.98)	$ (0.49)
Weighted average shares used in computing net earnings (loss) per common share:
Basic	8,188,837	6,741,578	8,102,087	6,120,447
Diluted	8,188,837	9,263,149	8,102,087	6,120,447