Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	[1]
Current assets:
Cash and cash equivalents	$ 67,326	$ 57,937
Short-term investments	90,540	130,333
Receivable from collaboration partners	344	132
Prepaid expenses and other current assets	8,007	4,303
Total current assets	166,217	192,705
Property and equipment, net	8,761	9,330
Restricted cash	203	203
Other long-term assets	963	872
Total assets	176,144	203,110
Current liabilities
Accounts payable	2,426	4,704
Accrued liabilities	10,170	9,522
Deferred revenue, current	7,000	7,000
Other current liabilities	1,408	1,480
Total current liabilities	21,004	22,706
Deferred revenue, noncurrent	10,272	12,022
Deferred rent	3,590	3,734
Other long-term liabilities	640	806
Total liabilities	35,506	39,268
Stockholders’ equity:
Preferred stock, $0.0001 par value, 10,000,000 shares authorized as of March 31, 2020 and December 31, 2019; no shares issued and outstanding as of March 31, 2020 and December 31, 2019	0	0
Common stock, $0.0001 par value, 400,000,000 shares authorized as of March 31, 2020 and December 31, 2019; 45,982,788 and 45,925,004 shares issued and outstanding as of March 31, 2020 and December 31, 2019, respectively	4	4
Additional paid-in capital	373,425	369,100
Accumulated deficit	(233,079)	(205,326)
Accumulated other comprehensive income	288	64
Total stockholders’ equity	140,638	163,842	[2]
Total liabilities, convertible preferred stock and stockholders’ equity	$ 176,144	$ 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.