CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 16,650	$ 28,553
Restricted cash	487	1,254
Accounts receivable, net of allowances of $2,666 and $2,745 as of December 31, 2022 and 2021, respectively	24,826	19,963
Inventories	28,958	19,924
Prepaid expenses and other current assets	4,177	3,032
Total current assets	75,098	72,726
Property and equipment, net	6,719	4,066
Operating lease right-of-use assets	4,373	2,088
Intangible assets, net	5,265	6,445
Goodwill	10,190	10,268
Other assets	1,120	1,070
Total assets	102,765	96,663
Current liabilities:
Accounts payable	14,760	10,502
Operating lease liabilities	1,190	1,269
Deferred revenue	2,068	2,153
Accrued compensation and related benefits	2,757	3,150
Other accrued expenses and liabilities	2,618	3,774
Total current liabilities	23,393	20,848
Long-term operating lease liabilities	3,366	938
Long-term deferred revenue	587	280
Other long-term liabilities	25	85
Total liabilities	27,371	22,151
Commitments and contingencies (see Note 16)
Stockholders' equity:
Common stock, $0.001 par value: 50,000 shares authorized; 24,168 and 23,707 shares issued and 22,623 and 22,230 shares outstanding as of December 31, 2022 and 2021, respectively	24	24
Additional paid-in capital	495,818	492,657
Treasury stock 1,545 and 1,477 shares as of December 31, 2022 and 2021, respectively	(12,173)	(11,134)
Accumulated deficit	(409,381)	(408,989)
Accumulated other comprehensive income	1,101	1,949
Total stockholders' equity	75,394	74,512
Total liabilities and stockholders' equity	102,765	96,663
Series B Convertible Preferred Stock
Stockholders' equity:
Series B preferred stock, $0.001 par value: 5,000 shares authorized; 5,000 shares issued and outstanding as of December 31, 2022 and 2021, respectively	$ 5	$ 5