Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2022	Sep. 30, 2021
Current assets:
Cash and cash equivalents	$ 28,367	$ 57,206
Short-term marketable securities	224,921	186,796
Accounts receivable	19,479	23,576
Prepaid expenses and other current assets	11,540	14,188
Income tax receivable	28,728	37,255
Total current assets	313,035	319,021
Long-term marketable securities	39,427	108,416
Property and equipment, net	4,588	5,943
Operating lease, right-of-use assets	23,493	4,711
Restricted cash	3,968	608
Other long-term assets	703	92
Total assets	385,214	438,791
Current liabilities:
Accounts payable	1,245	9,540
Accrued expenses and other current liabilities	19,191	22,429
Operating lease liabilities	2,599	4,203
Total current liabilities	23,035	36,172
Operating lease liabilities, net of current portion	22,209	1,126
Series 1 nonconvertible preferred stock	1,506	1,506
Other long-term liabilities	441	558
Total liabilities	47,191	39,362
Commitments and contingencies (Note 11)
Stockholders' equity:
Common stock; $0.01 par value per share, 100,000 shares authorized; 20,720 and 20,238 shares issued and outstanding at June 30, 2022 and September 30, 2021, respectively	207	202
Additional paid-in capital	388,267	351,033
Accumulated other comprehensive loss	(3,620)	(382)
(Accumulated deficit) retained earnings	(46,831)	48,576
Total stockholders' equity	338,023	399,429
Total liabilities and stockholders' equity	$ 385,214	$ 438,791