September 30,

December 31,

2020

2019

Preferred stock dividends payable

$

2,901

$

2,901

Accrued compensation and related charges

2,213

3,307

Payable in connection with land restoration of Nanjing JinMei factory

720

703

Accrued income taxes

714

171

Accrued professional services

659

630

Accrued product warranty

529

387

Advance from customers

494

396

Current portion of operating lease liabilities

421

319

Other tax payable

357

50

Current portion of royalty payments

300

—

Payable in connection with construction

208

1,447

Other personnel-related costs

142

180

Accrual for sales returns

92

26

Payable in connection with repurchase of subsidiaries shares

49

151

Other accrued liabilities

1,043

1,013

$

10,842

$

11,681