Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 21,866	$ 14,184
Marketable investments	5,018	21,728
Accounts receivable, net	25,444	20,777
Inventories	31,322	28,782
Other current assets and prepaid expenses	3,716	2,903
Total current assets	87,366	88,374
Property and equipment, net	2,784	2,096
Deferred tax asset	21,402	19,055
Goodwill	1,339	1,339
Other long-term assets	6,048	374
Total assets	118,939	111,238
Current liabilities:
Accounts payable	13,321	7,002
Accrued liabilities	22,904	26,848
Deferred revenue	8,939	9,461
Total current liabilities	45,164	43,311
Deferred revenue, net of current portion	2,380	2,195
Income tax liability	352	379
Other long-term liabilities	640	460
Total liabilities	48,536	46,345
Commitments and Contingencies (Note 13)
Stockholders’ equity:
Common stock, $0.001 par value; authorized: 50,000,000 shares; issued and outstanding: 13,890,590 and 13,477,973 shares at September 30, 2018 and December 31, 2017, respectively	14	13
Additional paid-in capital	68,180	62,025
Accumulated income	2,283	2,947
Accumulated other comprehensive loss	(74)	(92)
Total stockholders’ equity	70,403	64,893
Total liabilities and stockholders’ equity	$ 118,939	$ 111,238