Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 9,858	$ 16,647
Short-term investments	30,004	24,994
Accounts receivable, net	3,257	1,871
Inventories, net	2,284	2,655
Prepaid expenses and other current assets	529	760
Total current assets	45,932	46,927
Property and equipment, net	888	357
Operating lease right-of-use asset, net	73	139
Intangible assets, net	1,772	1,397
Other assets	8	13
Total assets	48,673	48,833
Current liabilities:
Accounts payable	1,503	1,232
Accrued liabilities	1,366	721
Customer deposits	21	2
Deferred revenue- short term	94	16
Operating lease liability- short term	79	94
Business acquisition liability - short term	0	275
Total current liabilities	3,063	2,340
Long-term liabilities:
Deferred revenue- long term	146	0
Operating lease liability - long term	0	56
Business acquisition liability - long term	0	23
Total long-term liabilities	146	79
Total liabilities	3,209	2,419
Commitments and contingencies (Note 12)
Stockholders' equity:
Preferred stock - 5,000,000 authorized; par value $0.0001 per share; none issued and outstanding	0	0
Common stock - 150,000,000 authorized; par value $0.0001 per share; 40,748,861 and 37,554,162 shares issued and outstanding each period, respectively	4	4
Additional paid-in capital	89,979	71,705
Accumulated deficit	(44,530)	(25,310)
Accumulated other comprehensive income	11	15
Total stockholders' equity	45,464	46,414
Total liabilities and stockholders' equity	$ 48,673	$ 48,833