CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 27,614	$ 28,553
Restricted cash	1,074	1,254
Accounts receivable, net of allowances of $2,668 and $2,745 as of March 31, 2022 and December 31, 2021, respectively	19,452	19,963
Inventories	20,493	19,924
Prepaid expenses and other current assets	2,673	3,032
Total current assets	71,306	72,726
Property and equipment, net	4,341	4,066
Operating lease right-of-use assets	1,780	2,088
Intangible assets, net	6,182	6,445
Goodwill	10,288	10,268
Other assets	1,012	1,070
Total assets	94,909	96,663
Current liabilities:
Accounts payable	11,335	10,502
Operating lease liabilities	1,143	1,269
Deferred revenue	1,489	2,153
Accrued compensation and related benefits	2,675	3,150
Other accrued expenses and liabilities	3,316	3,774
Total current liabilities	19,958	20,848
Long-term operating lease liabilities	748	938
Long-term deferred revenue	295	280
Other long-term liabilities	74	85
Total liabilities	21,075	22,151
Commitments and contingencies (see Note 15)
Stockholders' equity:
Preferred stock, $0.001 par value: 10,000 shares authorized; 5,000 shares issued and outstanding as of March 31, 2022 and December 31, 2021	5	5
Common stock, $0.001 par value: 50,000 shares authorized; 23,794 and 23,707 shares issued and 22,300 and 22,230 shares outstanding as of March 31, 2022 and December 31, 2021, respectively	24	24
Additional paid-in capital	493,552	492,657
Treasury stock, 1,494 and 1,477 shares as of March 31, 2022 and December 31, 2021, respectively	(11,533)	(11,134)
Accumulated deficit	(409,988)	(408,989)
Accumulated other comprehensive income	1,774	1,949
Total stockholders' equity	73,834	74,512
Total liabilities and stockholders' equity	$ 94,909	$ 96,663