CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 64,871	$ 16,659
Marketable securities	401,269	106,099
Receivable from related party	9,299	8,737
Prepaid expenses and other current assets	7,459	2,486
Total current assets	482,898	133,981
Property and equipment, net	7,035	7,147
Operating lease right-of-use asset	28,194
Intangible assets, net	61,212	62,013
Goodwill	14,608	14,608
Restricted cash	1,084	214
Other noncurrent assets	39	2,566
Total assets	595,070	220,529
Current liabilities:
Accounts payable	6,656	11,400
Accrued expenses and other current liabilities	18,974	14,528
Operating lease liability, current	3,645
Deferred revenue, related party, current	13,109	17,124
Total current liabilities	42,384	43,052
Deferred rent, noncurrent		1,741
Deferred revenue, related party, noncurrent	9,773	14,727
Deferred tax liability	7,085	7,819
Operating lease liability, noncurrent	29,669
Other noncurrent liabilities	1,089	655
Total liabilities	90,000	67,994
Commitments and contingencies (Note 7)
Redeemable convertible preferred stock, $0.0001 par value; zero and 192,904,770 shares authorized at September 30, 2020 and December 31, 2019, respectively; zero and 39,600,423 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively; aggregate liquidation preference of zero and $308,688 at September 30, 2020 and December 31, 2019, respectively		305,109
Stockholders' equity (deficit):
Preferred stock, $0.0001 par value; 10,000,000 and zero shares authorized at September 30, 2020 and December 31, 2019, respectively; zero shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively
Common stock, $0.0001 par value; 300,000,000 and 249,000,000 shares authorized at September 30, 2020 and December 31, 2019, respectively; 66,324,753 and 3,292,124 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively	7
Additional paid-in capital	736,193	4,738
Accumulated other comprehensive income	211	74
Accumulated deficit	(231,341)	(157,386)
Total stockholders' equity (deficit)	505,070	(152,574)
Total liabilities, redeemable convertible preferred stock and stockholders' equity	$ 595,070	$ 220,529