Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	[1]
Current assets:
Cash and cash equivalents	$ 285,185	$ 57,937
Short-term investments	177,288	130,333
Receivable from collaboration partners	222	132
Accrued interest receivable	239	251
Prepaid expenses and other current assets	8,665	4,052
Total current assets	471,599	192,705
Property and equipment, net	8,264	9,330
Restricted cash	203	203
Other long-term assets	1,323	872
Total assets	481,389	203,110
Current liabilities
Accounts payable	12,052	4,704
Accrued research and development expenses	13,899	4,572
Other accrued liabilities	5,611	4,950
Deferred revenue, current	7,000	7,000
Other current liabilities	1,463	1,480
Total current liabilities	40,025	22,706
Deferred revenue, noncurrent	8,522	12,022
Deferred rent	3,439	3,734
Other long-term liabilities	693	806
Total liabilities	52,679	39,268
Stockholders’ equity:
Preferred stock, $0.0001 par value, 10,000,000 shares authorized as of June 30, 2020 and December 31, 2019; no shares issued and outstanding as of June 30, 2020 and December 31, 2019	0	0
Common stock, $0.0001 par value, 400,000,000 shares authorized as of June 30, 2020 and December 31, 2019; 58,940,933 and 45,925,004 shares issued and outstanding as of June 30, 2020 and December 31, 2019, respectively	6	4
Additional paid-in capital	706,713	369,100
Accumulated deficit	(278,153)	(205,326)
Accumulated other comprehensive income	144	64
Total stockholders’ equity	428,710	163,842	[2]
Total liabilities and stockholders’ equity	$ 481,389	$ 203,110

[1] The Condensed Consolidated Balance Sheet as of December 31, 2019 has been derived from the audited financial statements as of that date.

[2] The balances as of December 31, 2019 and 2018 have been derived from the audited financial statements as of that date.