CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 36,370	$ 11,409
Accounts receivable, net of allowances of $386 and $178 as of June 30, 2021 and December 31, 2020, respectively	17,746	18,927
Inventories	21,894	20,296
Prepaid expenses and other current assets	4,676	2,813
Total current assets	80,686	53,445
Property and equipment, net	4,101	2,827
Operating lease right-of-use assets	2,683	3,405
Intangible assets, net	7,036	7,563
Goodwill	10,299	10,266
Other assets	1,094	1,171
Total assets	105,899	78,677
Current liabilities:
Accounts payable	8,635	10,964
Contractual payment obligation	531	1,040
Financial liabilities, net of debt issuance costs of $127 and $59 as of June 30, 2021 and December 31, 2020, respectively	9,853	20,084
Operating lease liabilities	1,265	1,279
Deferred revenue	2,340	1,981
Accrued compensation and related benefits	2,943	2,985
Other accrued expenses and liabilities	4,537	3,240
Total current liabilities	30,104	41,573
Long-term operating lease liabilities	1,556	2,272
Long-term deferred revenue	281	385
Other long-term liabilities	268	258
Total liabilities	32,209	44,488
Commitments and contingencies (see Note 16)
Stockholders' equity:
Common stock, $0.001 par value: 50,000 shares authorized; 23,566 and 19,450 shares issued and 22,123 and 18,055 shares outstanding as of June 30, 2021 and December 31, 2020, respectively	23	19
Additional paid-in capital	491,431	452,129
Treasury stock, 1,443 and 1,395 shares as of June 30, 2021 and December 31, 2020, respectively	(10,519)	(9,933)
Accumulated deficit	(409,608)	(410,609)
Accumulated other comprehensive income	2,358	2,578
Total stockholders' equity	73,690	34,189
Total liabilities and stockholders' equity	105,899	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 June 30, 2021 and December 31, 2020	5	5
Total stockholders' equity	$ 5	$ 5