Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net Loss	$ (7,137,000)	$ (5,716,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	253,000	195,000
Stock-based compensation	1,354,000	963,000
Non-cash loss on disposal of assets	1,000	0
Non-cash investment income	(17,000)	0
Non-cash patent write-off	16,000	8,000
Changes in assets and liabilities:
Accounts receivable	116,000	(95,000)
Prepaid expenses and other current assets	(45,000)	80,000
Restricted cash	0	100,000
Operating lease right-of-use assets	55,000
Other assets	1,000	0
Accounts payable	69,000	403,000
Accrued expenses	11,000	(79,000)
Accrued salaries and payroll related expenses	(696,000)	(526,000)
Customer deposits	0	130,000
Operating lease liabilities	(11,000)	0
Deferred revenue	(67,000)	0
Net cash used in operating activities	(6,097,000)	(4,737,000)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment	(303,000)	(519,000)
Expenditures for patents and domain names	(105,000)	(43,000)
Redemption of investments held-to-maturity	19,359,000	0
Purchase of investments held-to-maturity	(8,956,000)	(24,985,000)
Net cash provided by (used in) investing activities	9,995,000	(25,547,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Net proceeds from the sale of common stock from underwritten public offering	0	18,381,000
Proceeds from exercise of warrants	400,000	43,000
Net cash provided by financing activities	400,000	18,424,000
Effects of exchange rates on cash, cash equivalents and restricted cash	(1,000)	3,000
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	4,297,000	(11,857,000)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — Beginning of period	4,605,000	19,624,000
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — End of period	8,902,000	7,767,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Taxes Paid	1,000	3,000
SUPPLEMENTAL DISCLOSURE OF NON-CASH ACTIVITIES
Restricted stock units issued in settlement of liability	0	436,000
Property and equipment included in accounts payable	124,000	8,000
Property and equipment included in accrued liabilities	92,000	0
Patents included in accounts payable	23,000	35,000
Patents included in accrued liabilities	19,000	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Total cash, cash equivalents and restricted cash	$ 4,605,000	$ 19,624,000