CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 34,905	$ 39,898
Investments	10,656	23,720
Trade accounts receivable, net	2,416	2,320
Inventory	5,194	5,067
Prepaid expenses	818	768
Other current assets	2,025	1,558
Total current assets	56,014	73,331
Property and equipment, net	3,478	5,389
Finance lease assets, net	2,422	0
Operating lease right of use assets, net	1,859	2,510
Other non-current assets	1,242	1,817
Total assets	65,015	83,047
Current liabilities:
Accounts payable	4,501	1,983
Accrued liabilities	2,682	2,853
Accrued interest	472	909
Deferred revenue	547	451
Current portion of convertible notes	56,413	0
Current portion of long-term debt	0	80
Finance lease, current	1,113	0
Operating lease, current	829	669
Total current liabilities	66,557	6,945
Finance lease, non-current	782	0
Operating lease, non-current	1,545	2,381
Other non-current liabilities	874	808
Accrued interest, related-party	663	0
Long-term, debt related-party	16,858	0
Convertible notes	0	107,984
Total liabilities	87,279	118,118
Commitments and contingencies (see note 16)
Stockholders' deficit:
Preferred shares, $0.001 par value 5,000,000 preferred shares authorized and 3,954,546 outstanding as of December 31, 2022 and 2021	4	4
Common stock, $0.001 par value 200,000,000 common shares authorized with 97,477,546 shares issued and outstanding on December 31, 2022 and 100,000,000 common shares authorized with 67,649,018 shares issued and outstanding on December 31, 2021	97	68
Contributed capital	630,341	580,652
Treasury stock	(45,067)	(45,067)
Accumulated deficit	(607,239)	(570,668)
Accumulated other comprehensive loss	(400)	(60)
Total stockholders' deficit	(22,264)	(35,071)
Total liabilities and stockholders' deficit	$ 65,015	$ 83,047