Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 52,805	$ 50,637
Marketable investments	162,636	163,954
Accounts receivable, net of doubtful accounts of $1,454 and $1,290 at March 31, 2018 and December 31, 2017, respectively	65,107	58,007
Inventories	94,616	94,901
Prepaid expenses and other current assets	12,774	14,735
Total current assets	387,938	382,234
Property and equipment, net	31,995	30,899
Intangible assets, net	28,241	23,778
Goodwill	8,414	8,178
Long-term investments	3,286	3,872
Deferred taxes	28,865	26,690
Other non-current assets	968	1,016
Total assets	489,707	476,667
Current liabilities:
Accounts payable	7,403	6,757
Accrued liabilities	42,850	44,825
Total current liabilities	50,253	51,582
Deferred rent	7,345	6,199
Other non-current liabilities	17,188	18,478
Total liabilities	74,786	76,259
Commitments and contingencies
Stockholders’ equity:
Common stock	34	33
Additional paid-in capital	404,299	396,810
Accumulated other comprehensive income	2,637	1,569
Retained earnings	7,951	1,996
Total stockholders’ equity	414,921	400,408
Total liabilities and stockholders’ equity	$ 489,707	$ 476,667