Condensed Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 198,939	$ 386,200
Short-term investments	122,180
Prepaid expenses and other current assets	3,595	2,804
Total current assets	324,714	389,004
Property and equipment, net	4,994	3,272
Operating lease right-of-use assets	1,028
Long-term investments	49,754
Restricted cash	871
Other assets	990	550
Total noncurrent assets	57,637	3,822
Total assets	382,351	392,826
Current liabilities:
Accounts payable	31,864	29,785
Accrued compensation	1,007	284
Accrued manufacturing expenses	15,538	13,012
Accrued expenses (including related party accrual of $1,874 and $677 as of March 31, 2021 and December 31, 2020, respectively)	5,774	3,766
Deferred rent — current		14
Operating lease liabilities — current	833
Total current liabilities	55,016	46,861
Deferred rent — long-term		10
Operating lease liabilities — long-term	295
Other liabilities	103	112
Total liabilities	55,414	46,983
Commitments and contingencies (Note 6)
Stockholders' Equity (Deficit)
Preferred stock, $0.001 par value — 10,000,000 shares authorized at March 31, 2021 and December 31, 2020; no shares issued and outstanding at March 31, 2021 and December 31, 2020, respectively
Common stock, $0.001 par value — 500,000,000 shares authorized at March 31, 2021 and December 31, 2020; 51,338,801 and 51,071,593 shares issued and outstanding at March 31, 2021 and December 31, 2020, respectively	54	54
Additional paid-in capital	546,714	544,353
Accumulated other comprehensive loss	(47)
Accumulated deficit	(219,784)	(198,564)
Total stockholders' equity (deficit)	326,937	345,843
Total liabilities, redeemable convertible preferred stock and stockholders' equity (deficit)	$ 382,351	$ 392,826