Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
CURRENT ASSETS:
Cash and cash equivalents	$ 58,490	$ 14,183
Marketable securities	53,699	149,824
Accounts receivable, net	624	4,222
Inventories, net	4,024	4,085
Prepaid and other current assets	5,496	5,051
Total current assets	122,333	177,365
Right-of-use assets	15,847
Property and equipment, net	7,621	5,129
Restricted cash	2,150	2,150
Other noncurrent assets	2,739	1,509
Total assets	150,690	186,153
CURRENT LIABILITIES:
Accounts payable	1,175	2,542
Accrued expenses and other current liabilities	9,888	8,739
Contract liabilities	1,518	2,287
Convertible notes	9,512	0
Total current liabilities	22,093	13,568
Operating lease liabilities, noncurrent	17,058
Deferred rent, noncurrent		3,032
Other noncurrent liabilities	518	786
Total liabilities	39,669	17,386
COMMITMENTS AND CONTINGENCIES (Note 19)
STOCKHOLDERS’ EQUITY:
Preferred stock—$0.0001 par value: 1,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock—$0.0001 par value: 300,000,000 shares authorized; 160,837,846 and 155,137,237 shares issued and outstanding at September 30, 2022 and December 31, 2021	16	16
Additional paid-in capital	339,408	320,937
Accumulated other comprehensive loss	(1,636)	(391)
Accumulated deficit	(226,767)	(151,795)
Total stockholders’ equity	111,021	168,767
Total liabilities and stockholders’ equity	$ 150,690	$ 186,153