Condensed Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents	$ 3,276	$ 3,708
Short-term investments, held -to-maturity	20,724	26,688
Accounts receivable, net of allowance for credit losses of $26 thousand and $83 thousand as of June 30, 2025 and December 31, 2024, respectively	5,140	4,312
Inventories, net	7,610	6,801
Prepaid expenses and other current assets	1,307	1,267
Total current assets	38,057	42,776
Property, plant and equipment, net	43,605	45,753
Operating right-of-use lease assets	14,960	15,767
Intangible assets, net	12,517	13,091
Other non-current assets	1,348	1,382
Total assets	110,487	118,769
Current liabilities:
Accounts payable	1,204	825
Accrued liabilities	3,388	4,541
Current portion of operating lease liabilities	1,886	1,800
Current portion of long-term debt	0	4,045
Total current liabilities	6,478	11,211
Deferred tax liabilities	868	827
Other accrued liabilities	0	10
Long-term debt, net	13,032	9,443
Long-term operating lease liabilities	14,052	14,884
Total liabilities	34,430	36,375
Commitments and contingencies (Note 16)
Stockholders’ equity:
Preferred stock, $0.00001 par value, 10,000,000 shares authorized at June 30, 2025 and December 31, 2024, respectively, zero shares issued and outstanding at June 30, 2025 and December 31, 2024	0	0
Common stock, $0.00001 par value, 490,000,000 shares authorized at June 30, 2025 and December 31, 2024, 53,514,288 and 53,409,727 shares issued and outstanding at June 30, 2025 and December 31, 2024, respectively	1	1
Additional paid-in capital	202,802	200,924
Accumulated deficit	(126,746)	(118,531)
Total stockholders’ equity	76,057	82,394
Total liabilities and stockholders' equity	$ 110,487	$ 118,769