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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Operating activities:    
Net loss $ (11,736) $ (33,325)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 2,757 3,540
Depreciation and amortization 2,623 2,463
Amortization of intangible assets 0 813
Loss on retirement of property and equipment 244 80
Gain on sale of product line (6,704) 0
Amortization of discount related to available-for-sale securities 0 (5)
Changes in operating assets and liabilities:    
Accounts receivable, net 25,137 (12,852)
Inventory 2,451 (1,993)
Prepaid expenses and other assets (2,521) (6,659)
Accounts payable (17,871) 276
Accrued liabilities (805) 7,110
Deferred revenue 866 17,201
Other long-term liabilities (264) (103)
Net cash used in operating activities (5,823) (23,454)
Investing activities:    
Purchases of property and equipment (1,875) (2,106)
Purchases of marketable securities 0 (8,732)
Maturities of marketable securities 0 11,266
Proceeds from sale of product line 10,350 0
Net cash provided by investing activities 8,475 428
Financing activities:    
Proceeds from exercise of stock options 8 13
Taxes paid for awards vested under equity incentive plan (5) (1,093)
Proceeds from line of credit 163,238 0
Repayment of line of credit (163,238) 0
Net cash provided by (used in) financing activities 3 (1,080)
Effect of exchange rate changes on cash and cash equivalents 198 65
Net increase (decrease) in cash and cash equivalents 2,853 (24,041)
Cash and cash equivalents at beginning of period 39,775 50,359
Cash and cash equivalents at end of period $ 42,628 $ 26,318