Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 12,676	$ 28,614
Accounts receivable	21	61
Inventory	7,487	5,824
Prepaid expenses and other current assets	1,979	2,131
Total current assets	22,163	36,630
Property and equipment, net	2,554	2,462
Intangible assets, net	3,050	3,216
Goodwill	2,791	2,791
Right-of-use assets	8,611	8,785
Other assets	365	365
Total assets	39,534	54,249
Current liabilities:
Accounts payable	3,486	2,904
Accrued expenses	4,604	4,389
Deferred revenue	16	16
Lease liability, current	799	774
Note payable, current		436
Total current liabilities	8,905	8,519
Lease liability, less current portion	9,833	10,040
Total liabilities	18,738	18,559
Commitments and contingencies (Note 8)
Stockholders' equity:
Preferred stock, $0.001 par value; authorized – 50,000 shares; no shares issued and outstanding
Common stock, $0.001 par value: authorized – 500,000 shares; issued and outstanding – 29,802 shares and 29,716 shares at March 31, 2022 and December 31, 2021, respectively	29	29
Additional paid-in-capital	274,240	271,861
Accumulated other comprehensive loss
Accumulated deficit	(253,473)	(236,200)
Total stockholders' equity	20,796	35,690
Total liabilities and stockholders' equity	$ 39,534	$ 54,249