Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 14,798	$ 28,614
Accounts receivable	8	61
Inventory	7,871	5,824
Prepaid expenses and other current assets	1,062	2,131
Total current assets	23,739	36,630
Property and equipment, net	2,386	2,462
Intangible assets, net	2,883	3,216
Goodwill	2,791	2,791
Right-of-use assets	8,433	8,785
Other assets	365	365
Total assets	40,597	54,249
Current liabilities:
Accounts payable	1,948	2,904
Accrued expenses	4,757	4,389
Deferred revenue	32	16
Lease liability, current	827	774
Note payable, current		436
Total current liabilities	7,564	8,519
Lease liability, less current	9,618	10,040
Total liabilities	17,182	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 – 37,126 shares and 29,716 shares at June 30, 2022 and December 31, 2021, respectively	37	29
Additional paid-in-capital	290,847	271,861
Accumulated other comprehensive loss
Accumulated deficit	(267,469)	(236,200)
Total stockholders' equity	23,415	35,690
Total liabilities and stockholders' equity	$ 40,597	$ 54,249