CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Apr. 01, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 25,577	$ 27,043
Short-term investments	15,227	17,602
Trade and other accounts receivable, net of allowances of $0 at both April 1, 2017 and at December 31, 2016	21,630	17,447
Inventories	24,077	24,876
Prepaid expenses and other current assets	2,103	1,768
Total current assets	88,614	88,736
Property, plant and equipment, net	11,883	11,237
Long-term investments	4,038	3,593
Restricted cash	1,450	1,602
Intangible assets, net of amortization of $6,342 at April 1, 2017 and $6,129 at December 31, 2016	2,045	2,258
Deferred income taxes and other long-term assets	698	898
Total assets	108,728	108,324
Current liabilities:
Accounts payable	6,824	5,323
Accrued payroll and related liabilities	4,029	4,220
Other accrued liabilities	6,429	17,011
Customer advances	11,572	5,422
Total current liabilities	28,854	31,976
Other long-term liabilities	3,288	3,082
Stockholders' equity:
Common stock, $0.001 par value	21	21
Additional paid-in capital	173,865	171,314
Treasury stock, 4,845 shares at both April 1, 2017 and December 31, 2016	(28,489)	(28,489)
Accumulated other comprehensive income	359	321
Accumulated deficit	(69,170)	(69,901)
Total stockholders' equity	76,586	73,266
Total liabilities and stockholders' equity	$ 108,728	$ 108,324