Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 177,947	$ 255,094
Prepaid expenses and other current assets	10,951	3,486
Total current assets	188,898	258,580
Property and equipment, net	1,968	1,730
Operating lease right-of-use assets	12,889	10,936
Other assets	2,356	2,153
Total assets	206,111	273,399
Current liabilities:
Accounts payable	12,321	8,340
Accrued expenses	28,716	16,146
Deferred revenue	3,944	3,987
Operating lease liabilities	2,303	1,437
Other liabilities	239	93
Total current liabilities	47,523	30,003
Operating lease liabilities	11,247	10,158
Long-term debt, net	24,626	4,977
Other liabilities	974	174
Total liabilities	84,370	45,312
Commitments (Note 13)
Stockholders' equity
Preferred stock, $0.0001 par value; 25,000,000 shares authorized; 0 shares issued and outstanding at December 31, 2021 and December 31, 2020, respectively	0	0
Common stock, $0.0001 par value; 175,000,000 shares authorized; 73,709,056 and 68,841,288 shares issued and outstanding at December 31, 2021 and December 31, 2020, respectively	7	7
Additional paid-in capital	572,213	508,499
Accumulated deficit	(450,479)	(280,419)
Total stockholders’ equity	121,741	228,087
Total liabilities and stockholders’ equity	$ 206,111	$ 273,399