Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 36,269	$ 54,004
Marketable securities	234,077	230,145
Prepaid expenses and other current assets	1,338	1,014
Total current assets	271,684	285,163
Property and equipment, net	851	1,047
Right-of-use asset	797	785
Total assets	273,332	286,995
Current liabilities:
Accounts payable	21,380	1,017
Accrued expenses	55,048	45,222
Lease liability	410	318
Total current liabilities	76,838	46,557
Long-term liabilities:
Lease liability	387	468
Total long term liabilities	387	468
Total liabilities	77,225	47,025
Stockholders' equity:
Preferred stock, par value $0.0001 per share authorized: 5,000,000 shares at December 31, 2020 and December 31, 2019; 1,969,797 shares issued and outstanding at December 31, 2020 and December 31, 2019
Common stock, par value $0.0001 per share authorized: 200,000,000 at December 31, 2020 and December 31, 2019; 15,508,146 and 15,429,154 shares issued and outstanding at December 31, 2020 and December 31, 2019, respectively	2	2
Additional paid-in-capital	863,495	665,385
Accumulated other comprehensive gain (loss)	(80)	47
Accumulated deficit	(667,310)	(425,464)
Total stockholders' equity	196,107	239,970
Total liabilities and stockholders' equity	$ 273,332	$ 286,995