Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 86,782	$ 82,642
Prepaid expenses and other current assets	544	2,303
Total current assets	87,326	84,945
Fixed assets, net	4,545	3,836
Lease right of use assets	1,164
Restricted cash	266	424
Total assets	93,301	89,205
Current liabilities:
Accounts payable	1,584	1,590
Accrued expenses	3,791	3,438
Current portion of lease liability	440
Other current liabilities	63	334
Total current liabilities	5,878	5,362
Deferred rent		894
Term loan payable to a bank	20,026
Other long-term debt	604	560
Lease liability, net of current portion	1,725
Warrant liability	4,996	18,252
Total liabilities	33,229	25,068
Commitments and contingencies (Note 15)
Stockholders' equity
Preferred stock, $0.01 par value; 10,000,000 shares authorized at June 30, 2022 and December 31, 2021, no shares issued or outstanding at June 30, 2022 and December 31, 2021, respectively.
Common stock, $0.01 par value; 150,000,000 shares authorized at June 30, 2022 and December 31, 2021; 29,014,517 and 28,689,842 shares issued at June 30, 2022 and December 31, 2021, respectively. 28,891,909 and 28,689,842 shares outstanding at June 30, 2022 and December 31, 2021, respectively.	290	286
Additional paid-in capital	145,548	144,146
Treasury stock (at cost)	(448)
Accumulated deficit	(85,318)	(80,295)
Total stockholders' equity	60,072	64,137
Total liabilities and stockholders' equity	$ 93,301	$ 89,205