Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 46,697	$ 57,379
Marketable securities	392,348	426,339
Prepaid expenses and other current assets	1,152	1,483
Total current assets	440,197	485,201
Property and equipment, net	1,184	227
Right-of-use asset	675
Total assets	442,056	485,428
Current liabilities:
Accounts payable	1,178	2,487
Accrued expenses	23,637	5,957
Lease liability	315
Total current liabilities	25,130	8,444
Long-term liabilities:
Lease liability	361
Total long term liabilities	361
Total liabilities	25,491	8,444
Stockholders' equity:
referred stock, par value $0.0001 per share authorized: 5,000,000 shares at December 31, 2019 and December 31, 2018; 1,969,797 shares issued and outstanding at December 31, 2019 and December 31, 2018
Common stock, par value $0.0001 per share authorized: 200,000,000 at December 31, 2019 and December 31, 2018; 15,429,154 and 15,409,023 shares issued and outstanding at December 31, 2019 and December 31, 2018, respectively	2	2
Additional paid-in-capital	639,567	616,573
Accumulated other comprehensive gain (loss)	216	(319)
Accumulated deficit	(223,220)	(139,272)
Total stockholders' equity	416,565	476,984
Total liabilities and stockholders' equity	$ 442,056	$ 485,428