UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 27,781	$ 38,660
Restricted cash	40	664
Accounts receivable, net of allowance for doubtful accounts of $1,329 and $1,316 at June 30, 2021 and December 31, 2020, respectively	9,713	11,764
Inventories, net	11,499	11,837
Income taxes receivable	71	403
Other current assets	3,255	3,127
Assets held for sale	546	0
Total current assets	52,905	66,455
Property and equipment, net	8,017	9,087
Operating lease right-of-use assets	2,162	2,320
Goodwill	8,092	8,092
Deferred tax assets, net	213	223
Other long-term assets	29	33
TOTAL ASSETS	71,418	86,210
Current liabilities:
Accounts payable	6,587	5,787
Accrued liabilities	17,221	18,275
Income taxes payable	39	21
Interest payable	58	34
Current portion of operating lease liabilities	589	636
Current portion of finance lease liabilities	55	60
Current portion of long-term debt	4,788	4,048
Total current liabilities	29,337	28,861
Deferred revenue, long-term	104	117
Long-term operating lease liabilities	8,011	8,348
Long-term finance lease liabilities	72	96
Long-term debt	0	1,617
TOTAL LIABILITIES	37,524	39,039
Commitments and contingencies (See Note 13)
Stockholders’ equity:
Preferred stock, $0.0001 par value, 100,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.0001 par value, 140,000,000 shares authorized; 79,606,743 shares issued and 70,152,591 shares outstanding at June 30, 2021; 78,669,414 shares issued and 73,088,494 shares outstanding at December 31, 2020	8	8
Additional paid-in capital	361,424	359,721
Accumulated other comprehensive income (loss)	13	(19)
Accumulated deficit	(293,534)	(278,688)
Treasury stock, at cost; 5,627,646 and 5,580,920 shares at June 30, 2021 and December 31, 2020, respectively	(34,017)	(33,851)
Total stockholders’ equity	33,894	47,171
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 71,418	$ 86,210