CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (76,925,380)	$ (89,875,459)	$ (85,077,024)
Adjustments to reconcile net loss to net cash flows used in operating activities:
Depreciation	141,601	77,906	29,959
Amortization of intangible assets	71,516	54,545	32,441
Provision for doubtful accounts	4,206	2,524,909	22,157
Share-based compensation	6,889,323	17,411,021	7,189,699
Changes in operating assets and liabilities:
Accounts receivable	167,691	(3,975,893)	(917,656)
Inventory	(409,037)	(386,168)	491,960
Other current assets	(4,434,130)	709,907	(773,532)
Other assets			(17,442)
Accounts payable	(3,260,914)	4,232,340	(3,200,955)
Deferred revenue			(522,613)
Other current liabilities	1,599,510	84,559	3,698,887
Net cash used in operating activities	(76,155,614)	(69,142,333)	(79,044,119)
CASH FLOWS FROM INVESTING ACTIVITIES
Patent costs	(765,291)	(845,266)	(419,104)
Purchase of fixed assets	(61,817)	(396,154)	(165,257)
Payment of security deposit		(14,036)
Net cash used in investing activities	(827,108)	(1,255,456)	(584,361)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from sale of common stock, net of costs	68,572,635	134,863,475	91,374,649
Proceeds from exercise of options	212,615	989,060	1,232,579
Proceeds from exercise of warrants	3,798,999	1,373,000	366,000
Net cash provided by financing activities	72,584,249	137,225,535	92,973,228
(Decrease) increase in cash	(4,398,473)	66,827,746	13,344,748
Cash, beginning of period	131,534,101	64,706,355	51,361,607
Cash, end of period	$ 127,135,628	$ 131,534,101	$ 64,706,355