Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 255,094	$ 62,351
Short-term marketable securities	0	37,439
Prepaid expenses and other current assets	3,486	1,536
Total current assets	258,580	101,326
Property and equipment, net	1,730	2,164
Operating lease right-of-use assets	10,936	2,598
Other assets	2,153	1,453
Total assets	273,399	107,541
Current liabilities:
Accounts payable	8,340	7,296
Accrued expenses	16,146	8,986
Deferred revenue	3,987	4,815
Operating lease liabilities	1,437	2,219
Short-term debt	0	667
Other liabilities	93	87
Total current liabilities	30,003	24,070
Operating lease liabilities	10,158	677
Long-term debt, net	4,977	4,201
Other liabilities	174	275
Total liabilities	45,312	29,223
Commitments (Note 14)
Stockholders' equity
Preferred stock, $0.0001 par value; 25,000,000 shares authorized; 0 shares issued and outstanding at December 31, 2020 and December 31, 2019, respectively	0	0
Common stock, $0.0001 par value; 175,000,000 shares authorized; 68,841,288 and 45,388,023 shares issued and outstanding at December 31, 2020 and December 31, 2019, respectively	7	5
Additional paid-in capital	508,499	270,662
Accumulated other comprehensive income	0	25
Accumulated deficit	(280,419)	(192,374)
Total stockholders’ equity	228,087	78,318
Total liabilities and stockholders’ equity	$ 273,399	$ 107,541