CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 24,027	$ 24,918
Marketable securities	165,627	86,592
Prepaid expenses and other current assets	3,319	4,088
Total current assets	192,973	115,598
Property and equipment, net	2,741	2,982
Other assets	2,922	389
Total assets	198,636	118,969
Current liabilities:
Accounts payable	1,999	2,383
Accrued expenses	6,326	4,935
Deferred revenue, current	1,016	4,096
Other current liabilities	254	328
Total current liabilities	9,595	11,742
Deferred revenue, net of current portion	511	863
Deferred rent, net of current portion	2,150	2,185
Total liabilities	12,256	14,790
Commitments (see note 6)
Stockholders' equity:
Preferred stock, $0.0001 par value: 50,000,000 shares authorized; no shares issued and outstanding at December 31, 2021 and 2020
Common stock, $0.0001 par value; 500,000,000 shares authorized; 29,555,119 and 24,773,361 shares issued and outstanding at December 31, 2021 and 2020, respectively	3	2
Additional paid-in capital	470,629	319,196
Accumulated other comprehensive loss	(206)	(177)
Accumulated deficit	(284,046)	(214,842)
Total stockholders' equity	186,380	104,179
Total liabilities and stockholders' equity	$ 198,636	$ 118,969