Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 191,707	$ 255,094
Prepaid expenses and other current assets	7,649	3,486
Total current assets	199,356	258,580
Property and equipment, net	2,131	1,730
Operating lease right-of-use assets	13,171	10,936
Other assets	2,928	2,153
Total assets	217,586	273,399
Current liabilities:
Accounts payable	5,868	8,340
Accrued expenses	31,715	16,146
Deferred revenue	3,955	3,987
Operating lease liabilities	2,237	1,437
Short-term debt	0
Other liabilities	247	93
Total current liabilities	44,022	30,003
Long-term operating lease liabilities	11,904	10,158
Long-term debt, net	5,077	4,977
Other long-term liabilities	1,034	174
Total liabilities	62,037	45,312
Commitments
Stockholders' equity:
Preferred stock, $0.0001 par value; 25,000,000 shares authorized; 0 shares issued and outstanding at September 30, 2021 and December 31, 2020, respectively	0	0
Common stock,$0.0001 par value; 175,000,000 shares authorized; 71,865,399 and 68,841,288 shares issued and outstanding at September 30, 2021 and December 31, 2020, respectively	7	7
Additional paid-in capital	557,038	508,499
Accumulated deficit	(401,496)	(280,419)
Total stockholders’ equity	155,549	228,087
Total liabilities and stockholders’ equity	$ 217,586	$ 273,399