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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net loss $ (3,900) $ (9,535)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 2,202 1,906
Stock-based compensation 4,316 4,612
Other non-cash items (278) 276
Changes in operating assets and liabilities:    
Accounts receivable, net 5,214 15,641
Inventory (2,222) 772
Prepaid expenses and other assets (1,699) (1,167)
Accounts payable (1,624) (824)
Accrued liabilities (1,647) (3,351)
Deferred revenue 197 2,039
Other (14) 69
Net cash provided by operating activities 545 10,438
Cash flows from investing activities:    
Purchases of marketable securities (18,616) (69,530)
Proceeds from sales and maturities of marketable securities 18,314 214
Purchases of property and equipment (678) (1,388)
Net cash used in investing activities (980) (70,704)
Cash flows from financing activities:    
Proceeds from issuance of common stock under employee equity incentive plans, net of repurchases 2,065 370
Other (25) (25)
Net cash provided by financing activities 2,040 345
Net increase (decrease) in cash and cash equivalents 1,605 (59,921)
Cash and cash equivalents - beginning of period 28,975 98,117
Cash and cash equivalents - end of period 30,580 38,196
Non-cash investing and financing activities:    
Inventory transfers to property and equipment 783 345
Purchases of property and equipment included in accounts payable 458 364
Vesting of early exercised stock options $ 41 $ 0