Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 26,316	$ 26,052
Marketable investments	7,605	9,523
Accounts receivable, net of allowance for doubtful accounts of $1,355 and $1,257, respectively	21,556	19,637
Inventories	33,921	28,014
Other current assets and prepaid expenses	5,648	3,972
Total current assets	95,046	87,198
Property and equipment, net	2,817	2,672
Deferred tax assets	423	457
Operating lease right-of-use assets	7,702
Goodwill	1,339	1,339
Other long-term assets	6,411	5,971
Total assets	113,738	97,637
Current liabilities:
Accounts payable	12,685	11,279
Accrued liabilities	30,307	23,300
Operating lease liabilities	2,800
Extended warranty liabilities	1,999	3,159
Deferred revenue	10,831	9,882
Total current liabilities	58,622	47,620
Deferred revenue, net of current portion	3,391	2,684
Income tax liability	93	394
Operating lease liabilities, net of current portion	5,112
Other long-term liabilities	578	553
Total liabilities	67,796	51,251
Commitments and contingencies (Note 11)
Stockholders’ equity:
Common stock, $0.001 par value: Authorized: 50,000,000 shares; Issued and outstanding: 14,315,586 and 13,968,852 shares at December 31, 2019 and 2018, respectively	14	14
Additional paid-in capital	82,346	70,451
Retained earnings (accumulated deficit)	(36,358)	(24,010)
Accumulated other comprehensive loss	(60)	(69)
Total stockholders’ equity	45,942	46,386
Total liabilities and stockholders’ equity	$ 113,738	$ 97,637