Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 18,432	$ 14,184
Marketable investments	10,573	21,728
Accounts receivable, net	22,122	20,777
Inventories	30,138	28,782
Other current assets and prepaid expenses	3,469	2,903
Total current assets	84,734	88,374
Property and equipment, net	2,632	2,096
Deferred tax asset	21,219	19,055
Goodwill	1,339	1,339
Other long-term assets	5,807	374
Total assets	115,731	111,238
Current liabilities:
Accounts payable	10,743	7,002
Accrued liabilities	22,756	26,848
Deferred revenue	9,288	9,461
Total current liabilities	42,787	43,311
Deferred revenue, net of current portion	2,519	2,195
Income tax liability	386	379
Other long-term liabilities	665	460
Total liabilities	46,357	46,345
Commitments and Contingencies (Note 14)
Stockholders’ equity:
Common stock, $0.001 par value; authorized: 50,000,000 shares; issued and outstanding: 13,824,252 and 13,477,973 shares at June 30, 2018 and December 31, 2017, respectively	14	13
Additional paid-in capital	66,291	62,025
Accumulated deficit	3,156	2,947
Accumulated other comprehensive loss	(87)	(92)
Total stockholders’ equity	69,374	64,893
Total liabilities and stockholders’ equity	$ 115,731	$ 111,238