Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 60,357	$ 57,064
Investment in equity securities, at fair value	12,588	9,309
Accounts receivable, net of $0 allowance for doubtful accounts	5,767	4,645
Inventories	3,475	1,356
Prepaid expenses and other	1,318	1,651
Total current assets	83,505	74,025
Property, plant and equipment, net	3,348	2,062
Intangible assets, net	12,691	13,210
Long-term investments	34,679	29,442
Right of use assets	9,797	8,696
Other assets	506	299
Total assets	144,526	127,734
Current liabilities:
Accounts payable	5,519	3,669
Accrued and other current liabilities	2,488	3,015
Bank borrowings	1,548	826
Notes payable	466	466
Total current liabilities	10,021	7,976
Deferred income	2,354	2,351
Other liabilities	14,654	13,834
Total liabilities	27,029	24,161
Commitments and contingencies (Note 18)
Redeemable noncontrolling interest, at redemption value (Note 11)	22,697	22,033
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: 139,877,032 shares and 124,023,374 shares issued at June 30, 2021 and December 31, 2020, respectively; 139,797,487 shares and 123,943,829 shares outstanding at June 30, 2021 and December 31, 2020, respectively	1,399	1,240
Additional paid-in capital	690,539	658,246
Treasury stock, at cost: 79,545 shares held at June 30, 2021 and December 31, 2020	(8,034)	(8,034)
Accumulated other comprehensive income	1,159	589
Accumulated deficit	(590,263)	(570,501)
Total stockholders' equity	94,800	81,540
Total liabilities, redeemable noncontrolling interest and stockholders' equity	$ 144,526	$ 127,734