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Condensed Consolidated Statement of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Operating activities    
Net loss $ (27,841) $ (46,367)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 1,502 1,388
Amortization of premium on investments 695 768
Unrealized foreign exchange gain on short-term investments (620) 0
Stock-based compensation 7,340 6,446
Tax benefit on unrealized gain on available-for-sale securities (339) (271)
Changes in operating assets and liabilities:    
Accounts receivable 9,468 6,490
Prepaid expenses and other current assets (663) (780)
Other assets 358 (112)
Accounts payable (4,978) (2,118)
Accrued liabilities (3,214) (7,048)
Deferred revenue 190 (822)
Lease financing liability 136 156
Other long-term liabilities 708 80
Net cash used in operating activities (17,258) (42,190)
Investing activities    
Purchases of property and equipment (898) (448)
Purchases of available-for-sale securities (19) 0
Proceeds from maturities of available-for-sale securities 5,976 5,000
Net cash provided by investing activities 5,059 4,552
Financing activities    
Repayments of lease liability (101) (101)
Cash paid for payroll taxes on restricted stock unit releases (1,261) 0
Proceeds from issuance of common stock 1,213 721
Net cash provided by (used in) financing activities (149) 620
Effect of exchange rate change on cash and cash equivalents (17) (68)
Net decrease in cash and cash equivalents (12,365) (37,086)
Cash and cash equivalents at beginning of period 153,324 165,455
Cash and cash equivalents at end of period $ 140,959 $ 128,369