Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 106,438	$ 114,057
Marketable securities	28,164	13,998
Accounts receivable	6,596	9,914
Unbilled receivables	3,162	0
Prepaid expenses and other current assets	3,778	6,474
Total current assets	148,138	144,443
Property and equipment, net	2,794	2,142
Right-of-use asset, net	11,617	9,829
Long-term restricted cash	1,311	1,379
Investments	2,000	2,000
Other assets	26	90
Total assets	165,886	159,883
Current liabilities:
Accounts payable	316	224
Accrued expenses	14,084	10,533
Loan payable	8,476	5,961
Lease liability	1,608	1,049
Income taxes payable	0	601
Deferred revenue	593	53,883
Total current liabilities	25,077	72,251
Non-current liabilities:
Loan payable, net of current portion	17,786	19,673
Lease liability, net of current portion	10,055	8,598
Deferred revenue	0	11,417
Warrant liabilities	19,140	25,423
Total liabilities	72,058	137,362
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.0001 par value; 10,000,000 shares authorized; no shares issued and outstanding as of December 31, 2022 and December 31, 2021	0	0
Common stock, $0.0001 par value; 350,000,000 and 200,000,000 shares authorized as of December 31, 2022 and December 31, 2021, respectively; 153,042,435 and 123,622,965 shares issued and outstanding as of December 31, 2022 and December 31, 2021, respectively	15	12
Additional paid-in capital	493,308	457,391
Accumulated deficit	(394,937)	(430,316)
Accumulated other comprehensive loss	(4,558)	(4,566)
Total stockholders’ equity	93,828	22,521
Total liabilities and stockholders’ equity	$ 165,886	$ 159,883
Common Stock, Shares Authorized	350,000,000	200,000,000