CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents	$ 25,713	$ 15,738
Accounts receivable, net of expected credit losses of $251 and $227, respectively	8,403	9,102
Inventories, net	28,499	32,980
Prepaid expenses and other current assets	3,444	2,081
Total current assets	66,059	59,901
Property and equipment, net	25,673	26,636
Operating lease right-of-use assets	5,030	5,805
Restricted cash	1,109	1,109
Goodwill	549	536
Deferred income tax assets	125	96
Other long-term assets	2,102	2,112
Total assets	100,647	96,195
Current liabilities
Accounts payable	2,974	2,739
Contract liabilities	1,197	1,216
Accrued expenses and other current liabilities	11,810	15,609
Total current liabilities	15,981	19,564
Long-term loans payable, net	99,270	96,994
Other long-term liabilities	7,750	7,827
Total liabilities	123,001	124,385
Commitments and contingencies (Note 8)
Stockholders' deficit
Preferred stock ($0.001 par value) 25,000,000 shares authorized; no shares issued and outstanding as of March 31, 2023 and December 31, 2022
Common stock ($0.001 par value) 175,000,000 shares authorized as of March 31, 2023 and December 31, 2022, 46,215,938 and 28,516,047 shares issued and outstanding as of March 31, 2023 and December 31, 2022, respectively	46	29
Additional paid-in capital	485,714	461,940
Accumulated other comprehensive loss	(22)	(157)
Accumulated deficit	(508,092)	(490,002)
Total stockholders' deficit	(22,354)	(28,190)
Total liabilities and stockholders' deficit	$ 100,647	$ 96,195