Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 14,774	$ 26,316
Marketable investments	4,746	7,605
Accounts receivable, net of allowance for credit losses of $937 and $1,355, respectively	15,660	21,556
Inventories	36,941	33,921
Other current assets and prepaid expenses	4,831	5,648
Total current assets	76,952	95,046
Property and equipment, net	2,687	2,817
Deferred tax asset	408	423
Operating lease-right-of-use assets	7,143	7,702
Goodwill	1,339	1,339
Other long-term assets	5,901	6,411
Total assets	94,430	113,738
Current liabilities:
Accounts payable	14,604	12,685
Accrued liabilities	23,663	30,307
Operating lease liabilities	2,204	2,800
Extended warranty liability	1,765	1,999
Deferred revenue	10,180	10,831
Total current liabilities	52,416	58,622
Deferred revenue, net of current portion	2,789	3,391
Income tax liability	93	93
Operating lease liabilities, net of current portion	5,149	5,112
Other long-term liabilities	447	578
Total liabilities	60,894	67,796
Commitments and Contingencies (Notes 12 and 13)
Stockholders’ equity:
Common stock, $0.001 par value; authorized: 50,000,000 shares; issued and outstanding: 14,578,146 and 14,315,586 shares at March 31, 2020 and December 31, 2019, respectively	15	14
Additional paid-in capital	82,292	82,346
Accumulated deficit	(48,772)	(36,358)
Accumulated other comprehensive income (loss)	1	(60)
Total stockholders’ equity	33,536	45,942
Total liabilities and stockholders’ equity	$ 94,430	$ 113,738