Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net loss	$ (11,824)	$ (11,850)
Adjustments to reconcile net loss to net cash used in operating activities:
Non-cash lease expense	10
Depreciation and amortization	178	276
Stock-based compensation expense	1,121	893
Loss on sale and disposal of property and equipment	3	54
Changes in operating assets and liabilities:
Accounts receivable	76	(210)
Prepaid expenses and other assets	249	173
Inventories	(20)	63
Accounts payable, accrued liabilities and other liabilities	230	507
Net cash used in operating activities	(9,977)	(10,094)
Cash flows from investing activities:
Purchase of property and equipment	(267)	(121)
Net cash used in investing activities	(267)	(121)
Cash flows from financing activities:
Proceeds from sale of common stock, net of issuance costs		13,523
Proceeds from issuance of common stock in conjunction with the exercise of the underwriter’s option to purchase additional shares in connection with a public offering, net of issuance costs		2,092
Principal repayment of DECD loan	(143)	(141)
Proceeds from issuance of common stock from exercise of stock options	804	17
Proceeds from PPP loan	1,005
Proceeds from exercise of warrants	5,059
Proceeds from private placement, net of issuance costs	10,652
Net cash provided by financing activities	17,377	15,491
Net increase in cash and cash equivalents	7,133	5,276
Cash and cash equivalents, beginning of period	11,703	9,360
Cash and cash equivalents, end of period	18,836	14,636
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	27	31
Supplemental disclosure of noncash investing and financing activities:
Net increase in right-of-use assets	369	$ 84
Net changes in accounts payable related to capital expenditures	$ 154