Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 121,346	$ 142,072
Accounts receivable, net	3,601	2,560
Inventory	5,834	3,880
Prepaid expenses and other current assets	1,155	2,585
Total current assets	131,936	151,097
Property and equipment, net	1,610	1,425
Operating lease right-of-use asset	465	0
Other non-current assets	26	26
Total assets	134,037	152,548
Current liabilities:
Accounts payable	608	510
Accrued expenses	5,301	5,398
Total current liabilities	5,909	5,908
Operating lease liability, non-current portion	250	0
Other long-term liabilities	732	681
Total liabilities	6,891	6,589
Commitments and contingencies (Notes 5 and 10)
Stockholders' equity
Common stock, $0.01 par value, 200,000,000 authorized as of June 30, 2022 and December 31, 2021; 20,486,971 and 20,399,337 shares issued and outstanding as of June 30, 2022 and December 31, 2021, respectively	206	204
Additional paid-in capital	542,967	540,707
Accumulated deficit	(415,816)	(394,754)
Accumulated other comprehensive loss	(211)	(198)
Total stockholders' equity	127,146	145,959
Total liabilities and stockholders' equity	$ 134,037	$ 152,548