Statements Of Operations - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue:
Systems	$ 1,597,537	$ 1,954,859	$ 3,644,871	$ 4,965,855
Disposables, service and accessories	6,546,198	6,378,608	19,943,562	19,890,240
Total revenue	8,143,735	8,333,467	23,588,433	24,856,095
Cost of revenue:
Systems	888,800	1,245,330	2,029,760	2,724,326
Disposables, service and accessories	1,032,569	1,008,662	3,350,480	2,805,550
Total cost of revenue	1,921,369	2,253,992	5,380,240	5,529,876
Gross margin	6,222,366	6,079,475	18,208,193	19,326,219
Operating expenses:
Research and development	1,159,617	1,295,130	3,599,314	4,189,596
Sales and marketing	2,965,479	3,396,989	10,063,698	11,502,808
General and administrative	1,929,473	2,561,513	6,715,019	7,934,350
Total operating expenses	6,054,569	7,253,632	20,378,031	23,626,754
Operating income (loss)	167,797	(1,174,157)	(2,169,838)	(4,300,535)
Other expense	(4,459,042)	(9,852,514)	(1,029,479)	(9,685,850)
Interest income	7		15	362
Interest expense	(43,084)	(818,738)	(135,351)	(2,466,803)
Gain on extinguishment of debt		5,632,171		5,632,171
Net loss	(4,334,322)	(6,213,238)	(3,334,653)	(10,820,655)
Deemed dividend on convertible preferred stock		(6,137,476)		(6,137,476)
Cumulative dividend on convertible preferred stock	(337,963)		(1,070,812)
Net loss attributable to common stockholders	$ (4,672,285)	$ (12,350,714)	$ (4,405,465)	$ (16,958,131)
Net loss per share attributable to common stockholders:
Basic	$ (0.21)	$ (0.56)	$ (0.20)	$ (0.78)
Diluted	$ (0.21)	$ (0.56)	$ (0.20)	$ (0.78)
Weighted average number of common shares and equivalents:
Basic	22,750,405	21,869,177	22,551,496	21,758,529
Diluted	22,750,405	21,869,177	22,551,496	21,758,529