Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 32,925	$ 107,143
Marketable securities	45,344	16,213
Accounts receivable (inclusive of $23 and $23 from a related party at September 30, 2022 and December 31, 2021, respectively)	23	59
Prepaid expenses and other current assets	2,084	2,729
Restricted cash-current	250	250
Total current assets	80,626	126,394
Property and equipment, net	3,053	3,994
Right-of-use assets	9,908	12,863
Restricted cash	1,031	1,118
Total assets	94,618	144,369
Current liabilities:
Accounts payable	1,408	2,344
Accrued expenses and other current liabilities	5,947	8,998
Lease liabilities, current portion	4,462	4,845
Current portion of longterm debt	6,667	1,667
Deferred revenue from related party, current portion	12,071	17,034
Total current liabilities	30,555	34,888
Deferred revenue from related party, net of current portion		5,333
Lease liability, net of current portion	5,856	8,577
Long-term debt, net of discount and current portion	13,621	18,411
Other liabilities	176
Total liabilities	50,208	67,209
Commitments and contingencies (Note 9)
Stockholders' equity
Common stock, par value $0.001 per share; 175,000,000 shares authorized at September 30, 2022 and December 31, 2021; 32,454,237 and 32,359,895 shares issued and outstanding at September 30, 2022 and December 31, 2021, respectively	32	32
Preferred stock, par value $0.001 per share; 25,000,000 shares authorized at September 30, 2022 and December 31, 2021; no shares issued and outstanding at September 30, 2022 and December 31, 2021
Additional paid-in capital	295,129	290,377
Accumulated other comprehensive loss	(636)	(10)
Accumulated deficit	(250,115)	(213,239)
Total stockholders' equity	44,410	77,160
Total liabilities and stockholders' equity	$ 94,618	$ 144,369