Statements Of Operations - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue:
Systems	$ 1,828,439	$ 935,978	$ 2,047,334	$ 3,010,997
Disposables, service and accessories	6,638,587	6,938,645	13,397,364	13,511,632
Total revenue	8,467,026	7,874,623	15,444,698	16,522,629
Cost of revenue:
Systems	920,517	395,898	1,140,961	1,478,996
Disposables, service and accessories	1,281,729	699,173	2,317,911	1,796,888
Total cost of revenue	2,202,246	1,095,071	3,458,872	3,275,884
Gross margin	6,264,780	6,779,552	11,985,826	13,246,745
Operating expenses:
Research and development	1,281,264	1,421,380	2,439,697	2,894,465
Sales and marketing	3,472,619	4,211,706	7,098,219	8,105,819
General and administrative	1,945,676	2,786,046	4,785,546	5,372,838
Total operating expenses	6,699,559	8,419,132	14,323,462	16,373,122
Operating loss	(434,779)	(1,639,580)	(2,337,636)	(3,126,377)
Other income	300,255	135,370	3,429,563	166,664
Interest income	1	140	9	362
Interest expense	(42,776)	(829,046)	(92,267)	(1,648,066)
Net income (loss)	(177,299)	(2,333,116)	999,669	(4,607,417)
Cumulative dividend on convertible preferred stock	(369,661)		(732,849)
Net income attributable to convertible preferred stock			(167,539)
Earnings (net loss) attributable to common stockholders	$ (546,960)	$ (2,333,116)	$ 99,281	$ (4,607,417)
Earnings (net loss) per common share:
Basic	$ (0.02)	$ (0.11)	$ 0.00	$ (0.21)
Diluted	$ (0.02)	$ (0.11)	$ 0.00	$ (0.21)
Weighted average shares used in computing earnings (net loss) per common share:
Basic	22,581,330	21,793,583	22,450,392	21,702,597
Diluted	22,581,330	21,793,583	22,458,479	21,702,597