Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 11,363	$ 27,957
Accounts receivable, net	3,864	4,521
Prepaid expenses and other current assets	1,548	2,016
Total current assets	16,775	34,494
Property and equipment, net	120	3,213
Right-of-use assets, operating leases	1,912	3,844
Other non-current assets	508	533
Total assets	19,315	42,084
Current liabilities:
Accounts payable	664	1,011
Accrued expenses and other current liabilities	2,099	3,513
Operating lease liabilities	1,518	1,645
Total current liabilities	4,281	6,169
Operating lease liabilities, non-current	394	2,199
Other long-term liabilities	1,001	1,002
Total liabilities	5,676	9,370
Commitments and contingencies (Note 15)
Stockholders' equity:
Common stock, $0.001 par value - 142,857 shares authorized, 17,226 and 15,532 shares issued and outstanding at December 31, 2022 and 2021, respectively	18	17
Additional paid-in capital	358,869	355,996
Accumulated deficit	(344,251)	(322,334)
Accumulated other comprehensive loss	(997)	(965)
Total stockholders' equity	13,639	32,714
Total liabilities and stockholders' equity	$ 19,315	$ 42,084