Statements of Operations (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Revenues	$ 4,310,059	$ 2,647,422	$ 8,616,181	$ 4,922,669
Cost of revenues	2,639,402	1,572,370	5,337,004	3,054,883
Gross profit	1,670,657	1,075,052	3,279,177	1,867,786
Operating expenses:
Research and development	877,584	1,127,850	1,780,868	2,284,640
Sales and marketing	2,919,281	2,832,279	5,516,993	5,240,158
General and administrative	1,245,347	1,292,305	2,667,129	2,716,646
Total operating expenses	5,042,212	5,252,434	9,964,990	10,241,444
Loss from operations	(3,371,555)	(4,177,382)	(6,685,813)	(8,373,658)
Interest income	3,207	4,553	7,464	11,258
Change in fair value of warrant liability	130,552	77,309	208,153	171,625
Net loss	(3,237,796)	(4,095,520)	(6,470,196)	(8,190,775)
Deemed dividends attributable to preferred shareholders	0	(19,846,377)	(4,041,682)	(19,846,377)
Net loss applicable to common stockholders	$ (3,237,796)	$ (23,941,897)	$ (10,511,878)	$ (28,037,152)
Net loss per common share applicable to common stockholders, basic and diluted (in dollars per share)	$ (2.49)	$ (42.98)	$ (9.12)	$ (52.49)
Weighted average number of common shares outstanding, basic and diluted (in shares)	1,302,231	557,089	1,152,441	534,192