Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 29,826	$ 86,508
Short-term investments	72,652	39,000
Prepaid expenses and other current assets	1,343	1,567
Total current assets	103,821	127,075
Right-of-use asset	1,282	394
Other assets	190	45
Total assets	105,293	127,514
Current liabilities:
Accounts payable	995	1,557
Accrued expenses	3,657	3,281
Current portion of operating lease liabilities	573	365
Total current liabilities	5,225	5,203
Long term portion of operating lease liabilities	649
Total liabilities	5,874	5,203
Commitments (Note 7)
Stockholders' equity:
Common stock, $0.001 par value per share, 150,000,000 shares authorized; 13,016,955 shares issued and outstanding at June 30, 2022 and December 31, 2021	13	13
Additional paid-in capital	485,577	481,709
Accumulated other comprehensive loss	(186)
Accumulated deficit	(482,383)	(455,809)
Total stockholders' equity	99,419	122,311
Total liabilities and stockholders' equity	105,293	127,514
Preferred shares
Stockholders' equity:
Preferred stock
Series X redeemable convertible preferred stock
Stockholders' equity:
Preferred stock	$ 96,398	$ 96,398