Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues	$ 12,027,528	$ 7,299,830	$ 5,512,764
Cost of revenues	7,113,005	3,950,746	2,568,602
Gross profit	4,914,523	3,349,084	2,944,162
Operating expenses:
Research and development	4,394,353	3,894,786	4,075,976
Sales and marketing	10,855,445	7,232,971	2,913,112
General and administrative	4,872,670	5,497,513	4,725,123
Total operating expenses	20,122,468	16,625,270	11,714,211
Loss from operations	(15,207,945)	(13,276,186)	(8,770,049)
Interest income	19,132	5,232	4,606
Warrants offering costs	0	0	(50,874)
Change in fair value of warrant liability	275,662	4,083,606	1,050,095
Net loss	(14,913,151)	(9,187,348)	(7,766,222)
Deemed dividends attributable to preferred shareholders and returns of capital to common shareholders associated with equity offerings (Note 2)	(19,846,377)	(11,882,907)	(2,955,668)
Net loss applicable to common stockholders	$ (34,759,528)	$ (21,070,255)	$ (10,721,890)
Net loss per common share applicable to common stockholders, basic and diluted (See Note 2, Summary of Significant Accounting Policies)	$ (7.28)	$ (7.75)	$ (6.15)
Weighted average number of common shares outstanding, basic and diluted	4,777,037	2,719,285	1,743,494