Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Current assets:
Cash and cash equivalents	$ 93,667	$ 46,735
Short-term investments	196,335	91,372
Accounts receivable, net	26,376	12,104
Inventories	12,289	7,330
Prepaid expenses and other current assets	6,203	2,594
Total current assets	334,870	160,135
Property and equipment, net	25,466	20,835
Operating lease right-of-use assets	33,699
Goodwill	1,138	1,138
Intangible assets, net	307	508
Restricted cash, non-current	579	579
Other non-current assets	2,823	3,799
Total assets	398,882	186,994
Current liabilities:
Accounts payable	4,830	9,760
Accrued expenses	3,901	5,965
Accrued compensation	14,945	10,479
Current portion of operating lease liability	6,409
Current portion of long-term debt	3,333	3,333
Other current liabilities	2,611	817
Total current liabilities	36,029	30,354
Operating lease liability, net of current portion	24,837
Long-term debt, net of current portion	1,403	4,400
Other non-current liabilities	351	158
Total liabilities	62,620	34,912
Commitments and contingencies (Note 7)
Stockholders' equity
Common stock, $0.00001 par value—100,000 and 100,000 shares authorized at September 30, 2020 and 2019, respectively; 45,083 and 32,873 shares issued and outstanding at September 30, 2020 and 2019, respectively
Additional paid-in capital	794,630	470,425
Accumulated other comprehensive income	87	181
Accumulated deficit	(458,455)	(318,524)
Total stockholders' equity	336,262	152,082
Total liabilities and stockholders' equity	$ 398,882	$ 186,994