CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 111,958	$ 112,388
Marketable securities	67,892	62,684
Accounts receivable, less allowance of $538 and $691	62,142	64,194
Inventories, net	106,836	96,820
Income taxes receivable	4,499	6,111
Prepaid expenses and other current assets	11,218	8,710
Total current assets	364,545	350,907
Property, plant and equipment, net	18,575	18,874
Operating lease right-of-use assets	13,340
Goodwill	22,495	22,495
Identifiable intangible assets, net	6,674	7,448
Other assets	18,354	18,316
Total assets	443,983	418,040
Current liabilities:
Accounts payable and accrued liabilities	24,501	30,681
Deferred revenue	8,187	6,767
Current operating lease obligations	2,532
Other current liabilities	9,962	7,543
Total current liabilities	45,182	44,991
Non-current operating lease obligations	12,256
Other non-current liabilities	9,045	11,161
Total liabilities	66,483	56,152
Commitments and contingencies
Stockholders’ equity:
Common stock	31	31
Additional paid-in capital	372,396	369,893
Accumulated other comprehensive loss	(1,256)	(1,263)
Retained earnings (accumulated deficit)	6,329	(6,773)
Total stockholders’ equity	377,500	361,888
Total liabilities and stockholders’ equity	$ 443,983	$ 418,040