CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 67,770	$ 37,859
Marketable securities	109,589	87,872
Accounts receivable, less allowance of $460 in 2017 and $680 in 2016	65,283	64,912
Inventories	67,521	65,485
Income taxes receivable	7,220	2,389
Prepaid expenses and other current assets	4,699	4,113
Total current assets	322,082	262,630
Property, plant and equipment, net	17,342	11,858
Goodwill	22,495	22,495
Identifiable intangible assets, net	8,632	10,273
Deferred income taxes	14,879	30,850
Other assets	492	593
Total assets	385,922	338,699
Current liabilities:
Accounts payable	13,471	10,245
Accrued liabilities:
Payroll and related expenses	10,408	8,968
Royalties	494	493
Warranty	2,427	1,788
Deferred revenue	6,223	7,329
Other current liabilities	9,284	7,139
Total current liabilities	42,307	35,962
Other non-current liabilities	10,461	9,002
Total liabilities	52,768	44,964
Commitments and contingencies (Note 8)
Stockholders’ equity:
Preferred stock, $0.001 par value, 5,000 shares authorized, no shares issued and outstanding at December 31, 2017 and 2016		0
Common stock, $0.001 par value, 100,000 shares authorized, 31,604 and 31,127 issued and outstanding at December 31, 2017 and 2016, respectively.	32	31
Additional paid-in capital	386,196	381,189
Accumulated other comprehensive loss	(1,205)	(2,779)
Accumulated deficit	(51,869)	(84,706)
Total stockholders’ equity	333,154	293,735
Total liabilities and stockholders’ equity	$ 385,922	$ 338,699