Condensed Statements of Operations - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue:
Product	$ 577,127	$ 648,347	$ 1,177,317	$ 1,375,785
Service	1,318,689	51,000	1,583,731	113,292
Other		91,204		325,789
Total revenue	1,895,816	790,551	2,761,048	1,814,866
Cost of revenue	932,976	834,949	1,776,446	1,729,575
Gross margin	962,840	(44,398)	984,602	85,291
Operating expenses:
Selling, general and administrative	4,712,637	3,726,490	9,406,345	7,165,759
Research and development	2,611,591	953,222	4,605,692	1,641,437
Total operating expenses	7,324,228	4,679,712	14,012,037	8,807,196
Operating loss	(6,361,388)	(4,724,110)	(13,027,435)	(8,721,905)
Other income (expense):
Loss from change in stock warrant valuation	0	(628,643)	0	(239,683)
Interest expense	(538,889)	(476,071)	(931,346)	(955,448)
Interest income	31,092	11,065	66,571	11,142
Loss on settlement of convertible debt		(705,217)		(705,217)
Other	18,442	70,634	18,442	70,634
Total other income (expense)	(489,355)	(1,728,232)	(846,333)	(1,818,572)
Net loss before income taxes	(6,850,743)	(6,452,342)	(13,873,768)	(10,540,477)
Income taxes	860		4,259
Net loss	(6,851,603)	(6,452,342)	(13,878,027)	(10,540,477)
Accretion of stock issuance costs		(10,969)		(35,046)
Accretion of Series E warrant discount		(40,146)		(127,616)
Accretion of Series D and E redeemable convertible preferred stock dividends		(367,350)		(1,165,932)
Net loss attributable to common stockholders	$ (6,851,603)	$ (6,870,807)	$ (13,878,027)	$ (11,869,071)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.98)	$ (1.73)	$ (2.00)	$ (5.49)
Shares used in computing net loss per share attributable to common stockholders, basic and diluted	7,018,502	3,973,055	6,952,012	2,163,295