Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
Sep. 28, 2019	Sep. 29, 2018
Cash flows from operating activities:
Net income	$ 11,114	$ 45,624
Reconciliation of net income to net cash from operating activities:
Depreciation and amortization	7,712	4,962
Stock-based compensation	9,713	8,229
Disposal of fixed assets	(831)	38
Inventory write-down	4,139	870
Deferred income taxes	(4)	4,668
Changes in assets and liabilities:
Accounts receivable	(6,251)	11,520
Inventories	(13,130)	(6,351)
Inventories-delivered systems	63	(324)
Prepaid expenses and other	(1,461)	(1,224)
Operating lease - right of use assets	1,917
Accounts payable, accrued and other liabilities	(8,053)	9,623
Deferred revenue	(1,941)	5,126
Operating lease liabilities	(1,774)
Income taxes payable	(2,348)	647
Net cash provided by (used in) operating activities	(1,135)	83,408
Cash flows from investing activities:
Payments to acquire certain assets		(2,000)
Sales of marketable securities	3,968	19,776
Maturities of marketable securities	48,753	32,195
Purchases of marketable securities	(104,585)	(46,604)
Purchases of property, plant and equipment	(9,943)	(2,942)
Proceeds from sale of property, plant and equipment	896
Net cash provided by (used in) investing activities	(60,911)	425
Cash flows from financing activities:
Proceeds from sale of shares under employee stock option plans and purchase plan	4,554	3,826
Taxes paid on net issuance of stock awards	(2,505)	(3,122)
Repurchases of common stock under share repurchase plans		(22,987)
Net cash provided by (used in) financing activities	2,049	(22,283)
Effect of exchange rate changes on cash and cash equivalents	55	(346)
Net increase (decrease) in cash and cash equivalents	(59,942)	61,204
Cash and cash equivalents, beginning of period	110,951	34,899
Cash and cash equivalents, end of period	51,009	96,103
Supplemental disclosure of non-cash investing activities:
Transfers between inventory and property, plant and equipment, net	1,198	602
Unpaid property, plant and equipment	$ 1,062	$ 1,684

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