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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows from operating activities:    
Net loss $ (14,470) $ (23,711)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 3,717 4,673
Stock-based compensation 8,481 8,638
Other non-cash items 1,051 273
Changes in operating assets and liabilities:    
Accounts receivable, net 17,535 7,723
Inventory 2,846 1,861
Prepaid expenses and other assets (479) 44
Accounts payable (2,668) (3,048)
Accrued liabilities 348 (1,619)
Deferred revenue 2,960 8,559
Other (65) 84
Net cash provided by operating activities 19,256 3,477
Cash flows from investing activities:    
Purchases of marketable securities (92,682) 0
Proceeds from sales and maturities of marketable securities 7,609 0
Payment for acquisition (4,380) 0
Purchases of property and equipment (2,588) (1,811)
Net cash used in investing activities (92,041) (1,811)
Cash flows from financing activities:    
Proceeds from issuance of common stock under employee equity incentive plans, net of repurchases 3,350 2,626
Other (50) 0
Net cash provided by financing activities 3,300 2,626
Net increase (decrease) in cash and cash equivalents (69,485) 4,292
Cash and cash equivalents—beginning of period 98,117 91,905
Cash and cash equivalents—end of period 28,632 96,197
Supplemental Disclosure of Non-Cash Investing and Financing Activities:    
Common stock issued under asset purchase agreement 1,313 0
Inventory transfers to property and equipment 1,112 1,187
Purchases of property and equipment included in accounts payable and accrued liabilities $ 428 $ 486