Statements Of Operations - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Revenue:
Systems	$ 4,275,798	$ 5,776,843
Disposables, service and accessories	26,868,302	26,387,273
Total revenue	31,144,100	32,164,116
Cost of revenue:
Systems	6,199,643	3,660,012
Disposables, service and accessories	4,554,596	3,869,321
Total cost of revenue	10,754,239	7,529,333
Gross margin	20,389,861	24,634,783
Operating expenses:
Research and development	4,760,806	5,487,609
Sales and marketing	13,039,499	15,228,193
General and administrative	8,509,153	10,345,338
Total operating expenses	26,309,458	31,061,140
Operating loss	(5,919,597)	(6,426,357)
Other income (expense)	212,031	(2,009,150)
Interest expense (net)	(179,844)	(2,483,384)
Gain on extinguishment of debt		5,632,171
Net loss	(5,887,410)	(5,286,720)
Deemed dividend on convertible preferred stock		(6,145,402)
Cumulative dividend on convertible preferred stock	(1,432,259)	(368,152)
Net loss attributable to common stockholders	$ (7,319,669)	$ (11,800,274)
Net loss per share attributable to common stockholders:
Basic	$ (0.32)	$ (0.54)
Diluted	$ (0.32)	$ (0.54)
Weighted average number of common shares and equivalents:
Basic	22,614,248	21,807,634
Diluted	22,614,248	21,807,634