Statements of Operations and Comprehensive Loss - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net revenues	$ 5,068,663	$ 3,223,096
Costs and expenses:
Cost of revenues	9,345,122	6,920,111
Research and development expenses	3,364,747	2,713,367
General and administrative expenses	7,189,529	6,560,425
Sales and marketing expenses	6,343,971	5,054,230
Total costs and expenses	26,243,369	21,248,133
Loss from operations	(21,174,706)	(18,025,037)
Other income/(expense):
Interest expense, net	(482,623)	(525,880)
Other income	51,216	153,648
Total other income/(expense):	(431,407)	(372,232)
Loss before income taxes	(21,606,113)	(18,397,269)
Income tax expense	(7,624)	(2,053)
Net loss and comprehensive loss	$ (21,613,737)	$ (18,399,322)
Weighted-average shares outstanding used in computing net loss per share attributable to common shareholders:
Basic	27,246,292	9,578,285
Diluted	27,246,292	9,578,285
Net loss per common share:
Basic	$ (0.79)	$ (1.92)
Diluted	$ (0.79)	$ (1.92)