CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 11,518	$ 11,409
Accounts receivable, net of allowances of $132 and $178 as of March 31, 2021 and December 31, 2020, respectively	18,911	18,927
Inventories	19,308	20,296
Prepaid expenses and other current assets	3,065	2,813
Total current assets	52,802	53,445
Property and equipment, net	3,768	2,827
Operating lease right-of-use assets	2,974	3,405
Intangible assets, net	7,299	7,563
Goodwill	10,281	10,266
Other assets	1,142	1,171
Total assets	78,266	78,677
Current liabilities:
Accounts payable	10,217	10,964
Current portion - contractual payment obligation	788	1,040
Current portion - financial liabilities, net of debt issuance costs of $136 and $59 as of March 31, 2021 and December 31, 2020, respectively	22,334	20,084
Operating lease liabilities	1,243	1,279
Deferred revenue	1,634	1,981
Accrued compensation and related benefits	2,858	2,985
Other accrued expenses and liabilities	3,643	3,240
Total current liabilities	42,717	41,573
Long-term operating lease liabilities	1,875	2,272
Long-term deferred revenue	331	385
Other long-term liabilities	363	258
Total liabilities	45,286	44,488
Commitments and contingencies (see Note 16)
Stockholders' equity:
Common stock, $0.001 par value: 50,000 shares authorized; 19,581 and 19,450 shares issued and 18,161 and 18,055 shares outstanding as of March 31, 2021 and December 31, 2020, respectively	19	19
Additional paid-in capital	452,921	452,129
Treasury stock, 1,420 and 1,395 shares as of March 31, 2021 and December 31, 2020, respectively	(10,186)	(9,933)
Accumulated deficit	(412,074)	(410,609)
Accumulated other comprehensive income	2,295	2,578
Total stockholders' equity	32,980	34,189
Total liabilities and stockholders' equity	78,266	78,677
Series B Convertible Preferred Stock
Stockholders' equity:
Series B convertible preferred stock, $0.001 par value: 5,000 shares authorized; 5,000 shares issued and outstanding as of March 31, 2021 and December 31, 2020	5	5
Total stockholders' equity	$ 5	$ 5