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Condensed Consolidated Statement of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Operating activities    
Net loss $ (33,161) $ (27,841)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 1,525 1,502
Amortization of premium on investments 613 695
Unrealized loss (gain) on short-term investments 1 (620)
Loss on disposal of property and equipment (4) 0
Stock-based compensation 8,409 7,340
Tax benefit on unrealized gain on available-for-sale securities 0 (339)
Realized gain on sales of available-for-sale securities (30) 0
Changes in operating assets and liabilities:    
Accounts receivable 3,200 9,468
Prepaid expenses and other current assets (2,943) (663)
Other assets (833) 358
Accounts payable (3,273) (4,978)
Accrued liabilities (1,916) (3,214)
Deferred revenue 1,355 190
Lease financing liability 335 136
Other long-term liabilities (413) 708
Net cash used in operating activities (27,135) (17,258)
Investing activities    
Purchases of property and equipment (636) (898)
Proceeds from sale of property and equipment 5 0
Purchases of available-for-sale securities (30) (19)
Proceeds from sales of available-for-sale securities 10,205 0
Proceeds from maturities of available-for-sale securities 13,864 5,976
Net cash provided by investing activities 23,408 5,059
Financing activities    
Repayments of lease liability (101) (101)
Cash paid for payroll taxes on restricted stock unit releases (2,424) (1,261)
Proceeds from issuance of common stock 3,099 1,213
Net cash provided by (used in) financing activities 574 (149)
Effect of exchange rate change on cash and cash equivalents (31) (17)
Net decrease in cash and cash equivalents (3,184) (12,365)
Total cash and cash equivalents at beginning of period 173,782 153,324
Total cash and cash equivalents at end of period $ 170,598 $ 140,959