Accrued compensation and related charges

$

2,917

$

2,832

Preferred stock dividends payable

$

2,901

$

2,901

Payable in connection with construction in progress

1,929

1,985

Accrued professional services

609

1,460

Other tax payable

573

399

Current portion of operating lease liabilities

550

536

Accrued product warranty

435

451

Accrued income taxes

371

127

Advances from customers

331

1,590

Other personnel-related costs

258

256

Accrual for sales returns

36

28

Other accrued liabilities

1,462

1,991

$

12,372

$

14,556