CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	$ 49,882	$ 57,071
Accounts receivable, net	7,052	10,909
Inventories, net	38,368	36,562
Prepaid expenses and other current assets	4,400	5,205
Total current assets	99,702	109,747
Property and equipment, net	25,527	22,157
Operating lease right-of-use assets	7,217	7,045
Restricted cash	1,109	253
Goodwill	539	15,300
Intangible assets, net	55	4,398
Deferred income tax assets	48	78
Other long-term assets	942	1,107
Total assets	135,139	160,085
Current liabilities
Accounts payable	3,466	5,923
Contract liabilities	1,246	2,081
Accrued expenses and other current liabilities	14,145	28,559
Revolving loan facility		6,608
Total current liabilities	18,857	43,171
Long-term loans payable, net	96,672	39,726
Other long-term liabilities	5,871	10,521
Total liabilities	121,400	93,418
Commitments and contingencies (Note 10)
Stockholders' equity
Preferred stock ($0.001 par value) 25,000,000 shares authorized; no shares issued and outstanding as of June 30, 2022 and December 31, 2021
Common stock ($0.001 par value) 175,000,000 shares authorized as of June 30, 2022 and December 31, 2021, 26,692,883 and 26,126,253 shares issued and outstanding as of June 30, 2022 and December 31, 2021, respectively	27	26
Additional paid-in capital	456,290	443,358
Accumulated other comprehensive (loss) income	(214)	26
Accumulated deficit	(442,364)	(376,743)
Total stockholders' equity	13,739	66,667
Total liabilities and stockholders’ equity	$ 135,139	$ 160,085