UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 33,945	$ 38,660
Restricted cash	40	664
Accounts receivable, net of allowance for doubtful accounts of $1,320 and $1,316 at March 31, 2021 and December 31, 2020, respectively	11,522	11,764
Inventories, net	11,616	11,837
Income taxes receivable	53	403
Other current assets	2,179	3,127
Assets held for sale	546	0
Total current assets	59,901	66,455
Property and equipment, net	8,258	9,087
Operating lease right-of-use assets	2,217	2,320
Goodwill	8,092	8,092
Deferred tax assets, net	220	223
Other long-term assets	29	33
TOTAL ASSETS	78,717	86,210
Current liabilities:
Accounts payable	6,483	5,787
Accrued liabilities	17,931	18,275
Income taxes payable	20	21
Interest payable	46	34
Current portion of operating lease liabilities	597	636
Current portion of finance lease liabilities	61	60
Current portion of long-term debt	5,023	4,048
Total current liabilities	30,161	28,861
Deferred revenue, long-term	104	117
Long-term operating lease liabilities	8,099	8,348
Long-term finance lease liabilities	80	96
Long-term debt	642	1,617
TOTAL LIABILITIES	39,086	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; 78,275,814 shares issued and 72,702,298 shares outstanding at March 31, 2021; 78,669,414 shares issued and 73,088,494 shares outstanding at December 31, 2020	8	8
Additional paid-in capital	360,537	359,721
Accumulated other comprehensive income (loss)	30	(19)
Accumulated deficit	(286,988)	(278,688)
Treasury stock, at cost; 5,573,516 and 5,580,920 shares at March 31, 2021 and December 31, 2020, respectively	(33,956)	(33,851)
Total stockholders’ equity	39,631	47,171
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 78,717	$ 86,210