CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 68,055	$ 67,770
Marketable securities	112,266	109,589
Accounts receivable, less allowance of $523 and $460	74,672	65,283
Inventories, net	79,763	67,521
Income taxes receivable	4,971	7,220
Prepaid expenses and other current assets	6,045	4,699
Total current assets	345,772	322,082
Property, plant and equipment, net	17,498	17,342
Goodwill	22,495	22,495
Identifiable intangible assets, net	8,352	8,632
Other assets	15,385	15,371
Total assets	409,502	385,922
Current liabilities:
Accounts payable and accrued liabilities	31,966	26,800
Deferred revenue	7,897	6,223
Other current liabilities	9,016	9,284
Total current liabilities	48,879	42,307
Other non-current liabilities	10,894	10,461
Total liabilities	59,773	52,768
Commitments and contingencies
Stockholders’ equity:
Common stock	32	32
Additional paid-in capital	386,986	386,196
Accumulated other comprehensive loss	(550)	(1,205)
Accumulated deficit	(36,739)	(51,869)
Total stockholders’ equity	349,729	333,154
Total liabilities and stockholders’ equity	$ 409,502	$ 385,922