Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 18,862	$ 38,704
Investment in equity securities, at fair value	5,705	9,868
Accounts receivable, net of $0 allowance for doubtful accounts	10,260	9,803
Inventories	5,791	1,907
Prepaid expenses and other	1,666	1,688
Total current assets	42,284	61,970
Property, plant and equipment, net	14,853	12,712
Intangible assets, net	10,952	12,203
Long-term investments	41,671	40,128
Right of use assets	8,462	9,107
Other assets	635	2,178
Total assets	118,857	138,298
Current liabilities:
Accounts payable	4,598	4,789
Accrued and other current liabilities	7,576	8,397
Bank borrowings	1,001
Total current liabilities	13,175	13,186
Deferred income	2,658	2,828
Other liabilities	13,420	14,325
Total liabilities	29,253	30,339
Commitments and contingencies
Redeemable noncontrolling interest, at redemption value	22,661	23,457
Stockholders' equity:
Preferred stock, $1.00 par value: 5,000,000 shares authorized and 0 shares issued and outstanding	0	0
Common stock, $0.01 par value: 250,000,000 shares authorized at June 30, 2022 and December 31, 2021 13,733,459 shares and 13,987,578 shares issued at June 30, 2022 and December 31, 2021, respectively; 13,606,130 shares and 13,979,624 shares outstanding at June 30, 2022 and December 31, 2021, respectively	1,373	1,399
Additional paid-in capital	695,369	694,826
Treasury stock, at cost: 127,329 shares and 7,954 shares held at June 30, 2022 and December 31, 2021	(9,068)	(8,034)
Accumulated other comprehensive income	(160)	1,954
Accumulated deficit	(620,571)	(605,643)
Total stockholders' equity	66,943	84,502
Total liabilities, redeemable noncontrolling interest and stockholders' equity	$ 118,857	$ 138,298