Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 114,645	$ 138,685
Marketable securities	24,018	0
Accounts receivable	7,324	7,224
Prepaid expenses and other current assets	5,781	5,434
Total current assets	151,768	151,343
Property and equipment, net	1,807	1,395
Right-of-use asset, net	10,117	10,948
Long-term restricted cash	1,379	1,379
Investments	2,000	0
Other assets	91	370
Total assets	167,162	165,435
Current liabilities:
Accounts payable	1,593	443
Accrued expenses	10,742	8,146
Loan payable	4,125	0
Lease liability	1,013	908
Income taxes payable	15,828	0
Deferred revenue	62,315	72,050
Total current liabilities	95,616	81,547
Non-current liabilities:
Loan payable, net of current portion	21,304	24,793
Lease liability	8,873	9,647
Deferred revenue	20,057	38,746
Warrant liabilities	40,043	28,708
Total liabilities	185,893	183,441
Commitments and contingencies
Stockholders’ (deficit) equity:
Preferred stock, $0.0001 par value; 10,000,000 shares authorized; no shares issued and outstanding at September 30, 2021 and December 31, 2020	0	0
Common stock, $0.0001 par value; 200,000,000 shares authorized; 115,443,500 and 108,071,249 shares issued and outstanding as of September 30, 2021 and December 31, 2020, respectively	12	11
Additional paid-in capital	428,371	391,175
Accumulated deficit	(442,555)	(404,629)
Accumulated other comprehensive loss	(4,559)	(4,563)
Total stockholders’ (deficit) equity	(18,731)	(18,006)
Total liabilities and stockholders’ (deficit) equity	$ 167,162	$ 165,435