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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities:    
Net loss $ (32,678) $ (18,702)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 6,784 7,337
Stock-based compensation 13,246 8,314
Gain on settlement of contractual liability 0 (6,993)
Provision for doubtful accounts and sales allowance 1,575 52
Other non cash items 14 (31)
Changes in operating assets and liabilities:    
Accounts receivable, net 11,223 (4,771)
Inventory 922 (6,276)
Prepaid expenses and other assets (97) (3,303)
Accounts payable (1,086) 4,109
Accrued liabilities (1,510) 4,102
Accrued litigation expenses 18 (6,832)
Deferred revenue 9,118 9,670
Other 104 (197)
Net cash provided by (used in) operating activities 7,633 (13,521)
Cash flows from investing activities:    
Purchases of property and equipment (2,558) (5,380)
Net cash used in investing activities (2,558) (5,380)
Cash flows from financing activities:    
Proceeds from issuance of common stock under employee equity incentive plans, net of repurchases 3,238 4,399
Proceeds from initial public offering, net of offering costs 0 121,037
Principal payments on revolving credit facility 0 (20,000)
Other 306 (229)
Net cash provided by financing activities 3,544 105,207
Net increase in cash and cash equivalents 8,619 86,306
Cash and cash equivalents—beginning of period 91,905  
Cash and cash equivalents—end of period 100,524 107,099
Supplemental Disclosure of Non-Cash Investing and Financing Activities:    
Inventory transfers to property and equipment 2,213 4,072
Vesting of early exercised stock options 366 556
Accretion of Series D redeemable convertible preferred stock $ 0 $ 1,150