CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 22,534	$ 34,091
Marketable securities	268,672	300,514
Restricted cash	1,706	1,706
Prepaid expenses and other current assets	4,069	3,684
Total current assets	296,981	339,995
Property and equipment, net	15,819	12,090
Other assets	3,278	4,083
Total assets	316,078	356,168
Current liabilities:
Accounts payable	186	1,861
Accrued liabilities	3,754	4,871
Deferred rent, current portion	134	215
Term loan, current portion	1,667	1,667
Deferred revenue, current portion		6,428
Total current liabilities	5,741	15,042
Deferred rent, net of current portion	776	359
Term loan, net of current portion	2,222	3,333
Deferred revenue, net of current portion		15,950
Total liabilities	8,739	34,684
Stockholders’ equity
Preferred stock; par value of $0.001 per share, 10,000,000 shares authorized at September 30, 2020 and December 31, 2019. No shares issued and outstanding at September 30, 2020 and December 31, 2019
Common stock, par value of $0.001 per share; 100,000,000 shares authorized at September 30, 2020 and December 31, 2019, 27,553,089 and 27,499,260 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively	28	27
Additional paid-in capital	408,189	402,529
Accumulated other comprehensive income (loss)	1,298	(38)
Accumulated deficit	(102,176)	(81,034)
Total stockholders’ equity	307,339	321,484
Total liabilities, preferred stock and stockholders’ equity	$ 316,078	$ 356,168