CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 131,551,000	$ 200,851,000
Marketable securities	293,995,000	113,945,000
Accounts receivable	0	30,000,000
Prepaid and other current assets	11,261,000	6,242,000
Total current assets	436,807,000	351,038,000
Marketable securities, non-current	22,832,000	31,415,000
Property and equipment, net	1,517,000	1,499,000
Capital lease assets	1,017,000
Intangible assets	19,700,000
Other assets	122,000	102,000
Total assets	481,995,000	384,054,000
Current liabilities:
Accounts payable	6,337,000	7,459,000
Accrued expenses and other current liabilities	29,930,000	9,192,000
Related party liability	4,490,000	12,892,000
Capital lease liability - current	184,000	0
Total current liabilities	40,941,000	29,543,000
Capital lease liability - non-current	836,000	0
Total liabilities	41,777,000	29,543,000
Commitments and contingencies (Note 9)
Stockholders’ equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized as of June 30, 2020 and December 31, 2019; no shares issued or outstanding as of June 30, 2020 and December 31, 2019
Common stock, $0.001 par value; 200,000,000 shares authorized as of June 30, 2020 and December 31, 2019; 54,722,948 and 50,617,868 shares issued and outstanding as of June 30, 2020 and December 31, 2019, respectively	54,000	51,000
Additional paid-in capital	795,842,000	631,154,000
Accumulated other comprehensive income	655,000	5,000
Accumulated deficit	(356,333,000)	(276,699,000)
Total stockholders’ equity	440,218,000	354,511,000
Total liabilities and stockholders’ equity	$ 481,995,000	$ 384,054,000