Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 63,709	$ 143,513
Accounts receivable		3,000
Prepaid expenses and other current assets	4,495	4,122
Total current assets	68,204	150,635
Property and equipment, net	1,959	3,046
Restricted cash	2,305	2,305
Other assets		323
Operating lease right-of-use assets	27,432	69,843
Total assets	99,900	226,152
Current liabilities:
Accounts payable	2,511	3,971
Accrued expenses	8,893	6,810
Accrued restructuring expenses	3,162
Current portion of deferred revenue	715	12,507
Current portion of operating lease liabilities	6,562	9,936
Total current liabilities	21,843	33,224
Deferred revenue, net of current portion		9,196
Operating lease liabilities, net of current portion	20,909	59,756
Total liabilities	42,752	102,176
Commitments and contingencies (Note 9)
Stockholders' equity:
Preferred stock, $0.001 par value; 10,000,000 shares authorized at December 31, 2022 and 2021, respectively; No shares issued or outstanding.
Common stock, $0.001 par value; 200,000,000 shares authorized at December 31, 2022 and 2021, respectively; 29,491,125 and 28,133,368 shares issued and outstanding at December 31, 2022 and 2021, respectively.	29	28
Additional paid-in capital	332,093	319,458
Accumulated deficit	(274,974)	(195,510)
Total stockholders' equity	57,148	123,976
Total liabilities, and stockholders' equity	$ 99,900	$ 226,152