CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jul. 01, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 19,575	$ 27,043
Short-term investments	14,217	17,602
Trade and other accounts receivable, net of allowances of $0 at both July 1, 2017 and at December 31, 2016	26,635	17,447
Inventories	26,834	24,876
Prepaid expenses and other current assets	2,156	1,768
Total current assets	89,417	88,736
Property, plant and equipment, net	12,244	11,237
Long-term investments	7,568	3,593
Restricted cash	1,400	1,602
Intangible assets, net of amortization of $6,556 at July 1, 2017 and $6,129 at December 31, 2016	1,831	2,258
Deferred income taxes and other long-term assets	743	898
Total assets	113,203	108,324
Current liabilities:
Accounts payable	9,529	5,323
Accrued payroll and related liabilities	6,010	4,220
Other accrued liabilities	3,044	17,011
Customer advances	13,178	5,422
Total current liabilities	31,761	31,976
Other long-term liabilities	3,335	3,082
Stockholders' equity:
Common stock, $0.001 par value	22	21
Additional paid-in capital	174,245	171,314
Treasury stock, 4,845 shares at both July 1, 2017 and December 31, 2016	(28,489)	(28,489)
Accumulated other comprehensive income	399	321
Accumulated deficit	(68,070)	(69,901)
Total stockholders' equity	78,107	73,266
Total liabilities and stockholders' equity	$ 113,203	$ 108,324