Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 26, 2020	Dec. 28, 2019	[1]
Current assets:
Cash and cash equivalents	$ 11,932	$ 12,653
Accounts receivable, net of allowance for doubtful accounts of $278 as of September 26, 2020 and $187 as of December 28, 2019	6,083	9,323
Inventories	7,004	8,174
Prepaid expenses and other current assets	542	401
Total current assets	25,561	30,551
Property and equipment, net	451	730
Intangible assets, net	72	84
Goodwill	533	533
Operating lease right-of-use assets, net	1,693	2,764
Other long-term assets	149	151
Total assets	28,459	34,813
Current liabilities:
Accounts payable	1,475	2,592
Accrued compensation	1,889	2,398
Accrued expenses	1,682	1,544
Current portion of PPP loan	1,526
Accrued warranty	182	380
Deferred revenue	1,072	1,450
Operating lease liabilities	1,387	1,414
Total current liabilities	9,213	9,778
Long-term liabilities:
PPP loan	971
Accrued warranty	102	156
Deferred revenue	286	360
Operating lease liabilities	616	1,795
Other long-term liabilities	19	19
Total liabilities	11,207	12,108
Commitments and contingencies (Note 7)
Stockholders’ equity:
Preferred stock, $0.01 par value, 2,000,000 shares authorized, no shares issued and outstanding
Common stock, $0.01 par value: Authorized: 30,000,000 shares; Issued and outstanding 13,787,969 and 13,785,233 shares as of March 28, 2020 and December 28, 2019, respectively	148	147
Additional paid-in capital	73,837	73,093
Accumulated other comprehensive income	32	80
Accumulated deficit	(56,765)	(50,615)
Total stockholders’ equity	17,252	22,705
Total liabilities and stockholders’ equity	$ 28,459	$ 34,813

[1] Derived from the audited consolidated financial statements included in the Annual Report on Form 10-K filed with the SEC for the year ended December 28, 2019.