CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 29,218	$ 11,409
Accounts receivable, net of allowances of $395 and $178 as of September 30, 2021 and December 31, 2020, respectively	19,263	18,927
Inventories	21,617	20,296
Prepaid expenses and other current assets	4,107	2,813
Total current assets	74,205	53,445
Property and equipment, net	4,131	2,827
Operating lease right-of-use assets	2,370	3,405
Intangible assets, net	6,725	7,563
Goodwill	10,268	10,266
Other assets	1,113	1,171
Total assets	98,812	78,677
Current liabilities:
Accounts payable	9,311	10,964
Contractual payment obligation	269	1,040
Financial liabilities, net of debt issuance costs of $0 and $59 as of September 30, 2021 and December 31, 2020, respectively		20,084
Operating lease liabilities	1,285	1,279
Deferred revenue	2,343	1,981
Accrued compensation and related benefits	3,162	2,985
Other accrued expenses and liabilities	4,473	3,240
Total current liabilities	20,843	41,573
Long-term operating lease liabilities	1,214	2,272
Long-term deferred revenue	266	385
Other long-term liabilities	237	258
Total liabilities	22,560	44,488
Commitments and contingencies (see Note 16)
Stockholders' equity:
Common stock, $0.001 par value: 50,000 shares authorized; 23,641 and 19,450 shares issued and 22,178 and 18,055 shares outstanding as of September 30, 2021 and December 31, 2020, respectively	24	19
Additional paid-in capital	492,015	452,129
Treasury stock, 1,463 and 1,395 shares as of September 30, 2021 and December 31, 2020, respectively	(10,853)	(9,933)
Accumulated deficit	(407,068)	(410,609)
Accumulated other comprehensive income	2,129	2,578
Total stockholders' equity	76,252	34,189
Total liabilities and stockholders' equity	98,812	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 September 30, 2021 and December 31, 2020	5	5
Total stockholders' equity	$ 5	$ 5