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	$ (2,751)	$ (1,894)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	121	148
Stock-based compensation	197	199
Impairment of goodwill		420
Accrued interest	181	164
Other	(5)	(11)
Changes in assets and liabilities:
Accounts receivable	385	729
Inventories	255	(67)
Prepaid expenses and other assets	174	448
Accounts payable	(138)	(105)
Deferred revenue and other liabilities	(35)	(257)
Net cash used in operating activities	(1,616)	(226)
Cash flows from investing activities:
Purchases of property and equipment	(14)	(62)
Proceeds from maturities of short-term investments	300	925
Purchases of short-term investments		(1,567)
Net cash provided by (used in) investing activities	286	(704)
Cash flows from financing activities:
Proceeds from sale of common stock, net of financing costs	1,619
Net proceeds from exercise of pre-funded warrants	2
Taxes paid to net share settle equity awards	(2)	(4)
Net cash provided by (used in) financing activities	2,198	(4)
Net increase (decrease) in cash and cash equivalents	868	(934)
Cash and cash equivalents at beginning of period	6,053	7,104
Cash and cash equivalents at end of period	6,921	6,170
Supplemental disclosure:
Issuance of convertible notes in settlement of accrued interest	234	$ 187
Fair value of warrant exercise price adjustment considered as deemed dividend	392
PPP Note
Cash flows from financing activities:
Proceeds from PPP note	$ 579