Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 60,816	$ 96,692
Short-term investments, available-for-sale	177,272	218,221
Prepaid expenses and other current assets	7,692	3,922
Total current assets	245,780	318,835
Restricted cash	2,098	413
Property and equipment, net	12,856	9,350
Operating lease right-of-use assets	11,678	8,505
Other long-term assets	1,491	547
Total assets	273,903	337,650
Current liabilities:
Accounts payable	1,112	1,176
Operating lease liabilities, current portion	2,484	1,402
Accrued and other current liabilities	9,347	6,253
Total current liabilities	12,943	8,831
Operating lease liabilities, net of current portion	9,975	7,517
Other long-term liabilities	18	82
Total liabilities	22,936	16,430
Commitments and contingencies (Note 7)
Stockholders' equity:
Preferred stock, $0.0001 par value; 54,350,179 shares authorized at December 31, 2021 and 2020; no shares issued and outstanding at December 31, 2021 and 2020
Common stock, $0.0001 par value; 100,000,000 shares authorized at December 31, 2021 and 2020; 32,971,107 and 32,627,963 shares issued and outstanding at December 31, 2021 and 2020, respectively	3	3
Additional paid-in capital	455,210	439,235
Accumulated other comprehensive income (loss)	(150)	3
Accumulated deficit	(204,096)	(118,021)
Total stockholders' equity	250,967	321,220
Total liabilities and stockholders' equity	$ 273,903	$ 337,650