CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 100,168	$ 112,388
Marketable securities	70,602	62,684
Accounts receivable, less allowance of $1,032 and $691	66,357	64,194
Inventories, net	103,989	96,820
Income taxes receivable	5,046	6,111
Prepaid expenses and other current assets	9,958	8,710
Total current assets	356,120	350,907
Property, plant and equipment, net	18,599	18,874
Operating lease right-of-use assets	13,734
Goodwill	22,495	22,495
Identifiable intangible assets, net	7,061	7,448
Other assets	18,301	18,316
Total assets	436,310	418,040
Current liabilities:
Accounts payable and accrued liabilities	26,391	30,681
Deferred revenue	7,491	6,767
Current operating lease obligations	2,458
Other current liabilities	7,852	7,543
Total current liabilities	44,192	44,991
Non-current operating lease obligations	12,742
Other non-current liabilities	9,514	11,161
Total liabilities	66,448	56,152
Commitments and contingencies
Stockholders’ equity:
Common stock	31	31
Additional paid-in capital	370,714	369,893
Accumulated other comprehensive loss	(1,686)	(1,263)
Retained earnings (accumulated deficit)	803	(6,773)
Total stockholders’ equity	369,862	361,888
Total liabilities and stockholders’ equity	$ 436,310	$ 418,040