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Condensed Consolidated Statement of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Operating activities    
Net loss $ (34,410) $ (8,944)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation 4,218 3,330
Amortization of premium on investments 2,292 409
Loss on disposal of property and equipment 100 0
Stock-based compensation 20,232 9,734
Tax benefit on unrealized gain on available-for-sale securities (66) 0
Realized gain on sales of available-for-sale securities (89) 0
Changes in operating assets and liabilities:    
Accounts receivable 6,080 (3,930)
Prepaid expenses and other current assets 1,289 435
Other assets (243) (913)
Accounts payable (317) 1,829
Accrued liabilities (7,611) 8,657
Deferred revenue 28,494 34,837
Lease financing liability 474 468
Other long-term liabilities 289 267
Net cash provided by operating activities 20,732 46,179
Investing activities    
Purchases of property and equipment (1,668) (5,542)
Purchases of available-for-sale securities (8,217) 0
Proceeds from sales of available-for-sale securities 10,154 0
Proceeds from maturities of available-for-sale securities 14,035 38,546
Net cash provided by investing activities 14,304 33,004
Financing activities    
Repayments of lease liability (302) (302)
Proceeds from issuance of common stock, net 8,523 925
Payments of deferred offering costs 0 (2,194)
Net cash provided by (used in) financing activities 8,221 (1,571)
Effect of exchange rate change on cash and cash equivalents (62) (55)
Net increase in cash and cash equivalents 43,195 77,557
Cash and cash equivalents at beginning of period 165,455 76,332
Cash and cash equivalents at end of period $ 208,650 $ 153,889