Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash	$ 8,988	$ 7,065
Trade accounts receivable, net	542	757
Inventories	2,240	2,196
Prepaid expenses and other current assets	3,142	3,907
Total current assets	14,912	13,925
Property and equipment, net	2,041	2,294
Operating lease right-of-use assets	8,927	9,133
Intangible assets, net	228	244
Other noncurrent assets	1,351	1,351
Total assets	27,459	26,947
Current liabilities:
Trade accounts payable	5,608	3,756
Accrued expenses and other current liabilities	9,859	8,640
Loans payable, current	790	1,671
Deferred revenue, current	1,827	1,781
Total current liabilities	18,084	15,848
Warrant liabilities	1,254	1,892
Operating lease liabilities, net of current portion	7,165	7,301
Loans payable, noncurrent	8,260	7,811
Deferred revenue, noncurrent	9	9
Total liabilities	34,772	32,861
Commitments and contingencies (Note 11)
Stockholders' (deficit) equity:
Common stock par value $0.0001 per share; 675,000,000 shares authorized at March 31, 2023 and December 31, 2022; 127,173,552 shares and 113,335,530 shares issued and outstanding as of March 31, 2023 and December 31, 2022.	12	11
Additional paid-in capital	404,501	381,274
Accumulated deficit	(401,405)	(376,797)
Accumulated other comprehensive loss	(10,421)	(10,402)
Total stockholders' (deficit) equity	(7,313)	(5,914)
Total liabilities and stockholders’ equity	$ 27,459	$ 26,947
Common stock, authorized (in shares)	675,000,000	675,000,000