CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Cash and cash equivalents	$ 32,473	$ 31,584
Short-term investments	23,800	28,343
Accounts receivable, net of allowance of bad debt	672	758
Prepaid expenses and other current assets	3,399	3,612
Property and equipment, net	86,155	87,982
Other non-current assets	1,080	1,069
Accrued expenses	14,868	13,555
Income taxes payable	2,189	65
Long-term debt, current portion	1,190	1,179
Other current liabilities	128	968
Debt discount	125	141
Other non-current liabilities	$ 2,777	$ 2,736
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	20,059,505	20,059,505
Common stock, shares outstanding (in shares)	20,036,505	20,036,505
Treasury stock, par value (in dollars per share)	$ 0.001	$ 0.001
Treasury stock, shares (in shares)	23,000	23,000
VIE, Primary Beneficiary
Cash and cash equivalents	$ 8,611	$ 1,703
Short-term investments	3,537	11,128
Prepaid expenses and other current assets	172	27
Property and equipment, net	42,668	42,972
Other non-current assets	9	34
Accounts payable	19	16
Accrued expenses	186	489
Income taxes payable	6	3
Long-term debt, current portion	1,190	1,179
Other current liabilities	37	916
Debt discount	125	141
Long-term debt, net of current portion	46,988	47,279
Other non-current liabilities	$ 1,249	$ 1,198