Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (16,433,074)	$ (26,829,630)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	2,439,618	1,110,632
Amortization of debt discount	313,097
Non-cash interest expense	461,839
Inventory reserve	27,163
Depreciation	73,286	74,218
Changes in operating assets and liabilities:
Decrease in trade receivables	10,631	51,986
Decrease in inventory	59,285	165,679
(Increase) decrease in prepaid expenses and other current assets	(67,385)	23,165
Increase (decrease) in accounts payable	(1,564,381)	782,062
Increase (decrease) in accrued expenses	(363,280)	997,724
Decrease in deferred revenue	(8,823)	(76,401)
Net cash used in operating activities	(15,052,024)	(23,700,565)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of short-term investments	(14,106,369)
Sale of short-term investments	2,122,481	1,604,307
Purchase of equipment	(36,571)	(48,893)
Net cash used in (provided by) investing activities	(12,020,459)	1,555,414
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from sale of common stock from at-the-market program, net	15,234,529	21,968,007
Proceeds from senior convertible note		7,500,000
Payment of debt issuance costs in connection with senior convertible note		(108,787)
Proceeds from exchange agreement, related party	2,000,000
Proceeds from exercise of warrants	8,673,984	26,250
Proceeds from exercise of stock options	122,704	11,600
Payment of financing fees	(226,855)
Net cash provided by financing activities	25,804,362	29,397,070
Foreign exchange effects on cash	(2,015)	(7,878)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(1,270,136)	7,244,041
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH - BEGINNING OF YEAR	17,795,323	10,551,282
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH - END OF YEAR	16,525,187	17,795,323
Cash paid for interest	12,552	1,873
Supplemental Disclosure of Non-Cash Financing and Investing Activities:
Deemed dividend as a result of warrant modification	369,500
Deemed dividend as a result of exchange of convertible note, Series C-2, Series D and Series F convertible preferred shares, related party	26,733,098
Non-cash portion of debt discount on senior convertible notes		1,271,861
Issuance of common stock for vested restricted stock units	25	132
Issuance of common stock for payment of deferred fees		173,773
Right-of-use asset and lease liability recognized under ASC 842	5,000
Conversion of preferred stock to common stock	52
Write-off of fully depreciated computer equipment	$ 47,850