Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating activities:
Net loss	$ (9,658,000)	$ (6,545,000)	$ (7,403,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	65,000	266,000	95,000
Impairment of property and equipment	32,000
Loss on disposal of property and equipment	3,000	1,000
Impairment of operating lease right-of-use assets	125,000
Stock option modification expense	105,000	77,000	504,000
Non-cash (gain) loss on changes in fair value of warrant liability	(749,000)	(1,311,000)	101,000
Non-cash gain on changes in fair value of embedded derivative liability	(424,000)
Interest expense related to amortization of debt issuance and debt discount	670,000
Interest expense related to amortization of debt issuance related to related party notes payable	18,000
Issuance of warrants for services	59,000
Changes in operating assets and liabilities:
Accounts receivable	2,319,000	774,000	(1,509,000)
Inventory	(212,000)	198,000	369,000
Prepaid expenses and other current assets	888,000	(97,000)	313,000
Operating lease right-of-use assets	861,000
Other assets	9,000	62,000	(73,000)
Accounts payable and accrued liabilities	(1,800,000)	516,000	(260,000)
Operating lease liabilities	(1,066,000)
Deferred rent		(69,000)	27,000
Deferred revenue	(41,000)	(34,000)	(472,000)
Related party notes payable	204,000
Long-term obligations	42,000
Net cash used in operating activities	(7,929,000)	(5,568,000)	(6,270,000)
Investing activities:
Purchases of property and equipment	(19,000)	(44,000)	(244,000)
Net cash used in investing activities	(19,000)	(44,000)	(244,000)
Financing activities:
Proceeds from preferred stock issuances, net	2,598,000
Proceeds from common stock issuances, net	6,698,000	5,585,000
Proceeds from issuance of related party notes payable	1,000,000
Proceeds from exercise of options, net	189,000	11,000	185,000
Proceeds from stock options & RSUs sold to cover taxes	4,000	1,000	26,000
Proceeds from exercise of warrants	67,000		38,000
Settlement of restricted stock for tax withholding			(48,000)
Proceeds from convertible notes, net of discount	2,000,000
Payment on the convertible note	(652,000)
Debt issuance cost	(202,000)
Net cash provided by financing activities	11,702,000	5,597,000	201,000
Net increase (decrease) in cash, cash equivalents, and restricted cash	3,754,000	(15,000)	(6,313,000)
Cash, cash equivalents and restricted cash, beginning of year	3,658,000	3,673,000	9,986,000
Cash, cash equivalents and restricted cash, end of year	7,412,000	3,658,000	3,673,000
Supplemental disclosure of cash flow information:
Interest paid	148,000
Income taxes paid	14,000	14,000
Cumulative effect of adoption of New ASU		2,638,000
Addition of operating lease, right-of-use asset	2,473,000
Stock issued to consultants for services, included in accounts payable and accrued liabilities			1,000
Fixed asset purchases, included in accounts payable and accrued liabilities	10,000	(49,000)	(49,000)
Warrant liability transferred to equity	553,000		58,000
Fair value of warrants issued in connection with financings	5,269,000
Reclassification of EmeryStation lease security deposit from long term to short term	65,000
Reclassification of EmeryStation sublease security deposit from long term to short term	198,000
Conversion of Series A Preferred Stock to Common Stock [Member]
Supplemental disclosure of cash flow information:
Conversion of preferred stock to common stock	584,000
Employees and Directors [Member] | Share-based Payment Arrangement, Option [Member]
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense for options and stock issued	334,000	594,000	1,867,000
Nonemployees [Member]
Adjustments to reconcile net loss to net cash used in operating activities:
Issuance of RSUs	20,000		34,000
Supplemental disclosure of cash flow information:
Severance paid in RSU to non-employee			69,000
Nonemployees [Member] | Share-based Payment Arrangement, Option [Member]
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense for options and stock issued	37,000		137,000
Employee [Member]
Adjustments to reconcile net loss to net cash used in operating activities:
Issuance of RSUs	10,000
Former Employee [Member]
Adjustments to reconcile net loss to net cash used in operating activities:
Issuance of RSUs	220,000
Accounting Standards Update 2014-09 [Member]
Supplemental disclosure of cash flow information:
Cumulative effect of adoption of New ASU		2,638,000
Accounting Standards Update 2017-11 [Member]
Supplemental disclosure of cash flow information:
Cumulative effect of adoption of New ASU	$ 56,000