CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 19,197	$ 27,043
Short-term investments	18,037	17,602
Trade and other accounts receivable, net of allowances of $0 at both September 30, 2017 and at December 31, 2016	22,311	17,447
Inventories	32,581	24,876
Prepaid expenses and other current assets	2,825	1,768
Total current assets	94,951	88,736
Property, plant and equipment, net	12,509	11,237
Long-term investments	6,165	3,593
Restricted cash	1,400	1,602
Intangible assets, net of amortization of $6,725 at September 30, 2017 and $6,129 at December 31, 2016	1,662	2,258
Deferred income taxes and other long-term assets	745	898
Total assets	117,432	108,324
Current liabilities:
Accounts payable	7,036	5,323
Accrued payroll and related liabilities	5,781	4,220
Other accrued liabilities	7,856	17,011
Customer advances	12,347	5,422
Total current liabilities	33,020	31,976
Other long-term liabilities	2,994	3,082
Stockholders' equity:
Common stock, $0.001 par value	22	21
Additional paid-in capital	176,282	171,314
Treasury stock, 4,845 shares at both September 30, 2017 and December 31, 2016	(28,489)	(28,489)
Accumulated other comprehensive income	443	321
Accumulated deficit	(66,840)	(69,901)
Total stockholders' equity	81,418	73,266
Total liabilities and stockholders' equity	$ 117,432	$ 108,324