CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 28,553	$ 11,409
Restricted cash	1,254
Accounts receivable, net of allowances of $2,745 and $178 as of December 31, 2021 and 2020, respectively	19,963	18,927
Inventories	19,924	20,296
Prepaid expenses and other current assets	3,032	2,813
Total current assets	72,726	53,445
Property and equipment, net	4,066	2,827
Operating lease right-of-use assets	2,088	3,405
Intangible assets, net	6,445	7,563
Goodwill	10,268	10,266
Other assets	1,070	1,171
Total assets	96,663	78,677
Current liabilities:
Accounts payable	10,502	10,964
Current portion - contractual payment obligation		1,040
Current portion - financial liabilities, net of debt issuance costs of $0 and $59 as of December 31, 2021 and 2020, respectively		20,084
Operating lease liabilities	1,269	1,279
Deferred revenue	2,153	1,981
Accrued compensation and related benefits	3,150	2,985
Other accrued expenses and liabilities	3,774	3,240
Total current liabilities	20,848	41,573
Long-term operating lease liabilities	938	2,272
Long-term deferred revenue	280	385
Other long-term liabilities	85	258
Total liabilities	22,151	44,488
Commitments and contingencies (see Note 17)
Stockholders' equity:
Common stock, $0.001 par value: 50,000 shares authorized; 23,707 and 19,450 shares issued and 22,230 and 18,055 shares outstanding as of December 31, 2021 and 2020, respectively	24	19
Additional paid-in capital	492,657	452,129
Treasury stock 1,477 and 1,395 shares as of December 31, 2021 and 2020, respectively	(11,134)	(9,933)
Accumulated deficit	(408,989)	(410,609)
Accumulated other comprehensive income	1,949	2,578
Total stockholders' equity	74,512	34,189
Total liabilities and stockholders' equity	96,663	78,677
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, 2021 and 2020, respectively	$ 5	$ 5