Condensed Consolidated Balance Sheets - USD ($)	Sep. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 20,366,000	$ 22,245,000
Marketable securities	0	9,996,000
Accounts receivable	1,578,000	5,134,000
Inventories	4,242,000	3,909,000
Prepaid expenses and other current assets	2,690,000	3,110,000
Total current assets	28,876,000	44,394,000
Property and equipment, net	4,734,000	4,675,000
Operating lease right-of-use assets	9,058,000	9,766,000
Restricted cash	1,131,000	1,551,000
Other assets	153,000	153,000
Total assets	43,952,000	60,539,000
Current liabilities:
Accounts payable	2,063,000	2,832,000
Accrued expenses and other current liabilities	8,531,000	8,338,000
Derivative warrant liability	186,000
Deferred revenue	163,000	518,000
Total current liabilities	10,943,000	11,688,000
Notes payable	49,188,000	47,790,000
Operating lease liabilities, net of current portion	8,569,000	9,359,000
Deferred revenue, net of current portion	8,000	28,000
Derivative liability	1,792,000
Other liabilities	4,791,000	4,577,000
Commitments and contingencies (see Note 14)
Series A redeemable convertible preferred stock; $0.001 par value; 3,000 shares authorized at September 30, 2022; 3,000 shares issued and outstanding at September 30, 2022; liquidation value of $330,000; 0 shares issued and outstanding at December 31, 2021 (see Note 7)	330,000
Stockholders’ deficit
Preferred stock, $0.001 par value; 9,997,000 and 10,000,000 shares authorized at September 30, 2022 and December 31, 2021, respectively; no shares issued and outstanding at September 30, 2022 and December 31, 2021
Common stock, $0.001 par value; 400,000,000 shares authorized; 7,050,849 and 3,328,017 shares issued and outstanding at September 30, 2022 and December 31, 2021, respectively	7,000	3,000
Additional paid-in capital	492,444,000	459,314,000
Accumulated other comprehensive loss		(4,000)
Accumulated deficit	(524,120,000)	(472,216,000)
Total stockholders’ deficit	(31,669,000)	(12,903,000)
Total liabilities, Series A convertible redeemable preferred stock and stockholders’ deficit	$ 43,952,000	$ 60,539,000