CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 13,654	$ 39,898
Investments	36,722	23,720
Trade accounts receivable	2,114	2,320
Inventory	5,505	5,067
Prepaid expenses	1,522	768
Other current assets	1,594	1,558
Total current assets	61,111	73,331
Property and equipment, net	5,108	5,389
Right of use assets	2,347	2,510
Other non-current assets	1,791	1,817
Total assets	70,357	83,047
Current liabilities:
Accounts payable	2,717	1,983
Accrued liabilities	4,086	2,853
Accrued interest	156	909
Deferred revenue	398	451
Current portion of convertible notes	105,661	0
Current portion of long-term debt	82	80
Current portion of finance lease	76	0
Current operating lease liability	699	669
Total current liabilities	113,875	6,945
Finance lease, non-current	164	0
Operating lease liability, non-current	2,192	2,381
Other non-current liabilities	805	808
Convertible notes	9,377	107,984
Total liabilities	126,413	118,118
Commitments and contingencies
Stockholders’ deficit:
Preferred shares, $0.001 par value	4	4
Common stock, $0.001 par value	69	68
Contributed capital	547,381	580,652
Treasury stock	(45,067)	(45,067)
Accumulated deficit	(558,211)	(570,668)
Accumulated other comprehensive loss	(232)	(60)
Total stockholders’ deficit	(56,056)	(35,071)
Total liabilities and stockholders’ deficit	$ 70,357	$ 83,047