Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Oct. 31, 2018	Oct. 31, 2017
Current assets:
Cash and cash equivalents	$ 55,673	$ 70,961	$ 17,667
Short-term investments	6,162
Accounts receivable	712	940
Inventory	336	238
Prepaid expenses and other current assets	1,432	1,163	297
Total current assets	64,315	73,302	17,964
Non-current assets:
Property and equipment, net	13,736	12,927	2,173
Intangible assets, net	924	957
Goodwill	278	278
Other assets	913	378	15
Total non-current assets	15,851	14,540	2,188
TOTAL ASSETS	80,166	87,842	20,152
Current liabilities:
Accounts payable and accrued expenses	6,508	4,363	1,939
Other current liabilities	316	286
Current portion of long-term note payable	529	519
Deferred revenue	170	150
Warrant liability and embedded derivative			13,502
Total current liabilities	7,523	5,318	15,441
Long-term note payable, net	479	736
Other long-term liabilities	131	126
Total liabilities	8,133	6,180	15,441
Commitments and Contingencies
Redeemable convertible preferred stock - 0, 0, and 6,455 shares authorized, issued and outstanding at December 31, 2018, October 31, 2018 and 2017, respectively; liquidation preference - $0, $0, and $17,750, respectively			4,541
STOCKHOLDERS' EQUITY:
Convertible preferred stock - 25,000,000 shares authorized, 0, 0, and 3,230,655 shares issued and outstanding at December 31, 2018, October 31, 2018 and 2017; aggregate liquidation preference $0, $0, and $2,140, respectively			109,995
Common stock - $.001 par value; 250,000,000 shares authorized; 21,447,088, 21,423,999, and 6,515,524 shares issued and outstanding at December 31, 2018, October 31, 2018 and 2017, respectively	21	21	7
Additional paid-in capital	414,840	406,087	149,173
Accumulated other comprehensive income	36
Accumulated deficit	(342,864)	(324,446)	(259,005)
Total stockholders' equity	72,033	81,662	170
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 80,166	$ 87,842	$ 20,152