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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Operating activities:    
Net income (loss) $ (56,712) $ (48,080)
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, Depletion and Amortization 7,396 7,923
Amortization of Financing Costs and Discounts 4,786 4,485
Share-based compensation 14,445 21,381
Deferred Income Tax Expense (Benefit) 64 138
Provision for doubtful accounts (226) 132
Changes in operating assets and liabilities:    
Accounts and unbilled receivables 12,899 20,474
Prepaid expenses and other assets (746) (383)
Accounts payable (2,546) (3,330)
Accrued liabilities 887 364
Accrued payroll and other employee benefits 709 (4,909)
Deferred revenue 11,885 8,609
Net cash (used in) provided by operating activities (7,159) 6,804
Investing activities:    
Purchases of property and equipment (6,524) (4,856)
Internal-use software development costs capitalized (569) (233)
Payments to Acquire Short-term Investments (144,934) (55,176)
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities 96,500 32,700
Net cash (used in) provided by investing activities (55,527) (27,565)
Financing activities:    
Exercise of stock options 420 433
Proceeds from Stock Plans 1,090 839
Tax withholding related to net share settlement of restricted stock units (5,244) (4,966)
Business combination, payment of contingent consideration 0 (1,304)
Repayments of Notes Payable (196) (212)
Payments of Debt Issuance Costs 0 (408)
Net cash (used in) provided by financing activities (3,930) (5,618)
Effect of Exchange Rate on Cash and Cash Equivalents 54 308
Net change in cash and cash equivalents (66,562) (26,071)
Cash and cash equivalents:    
Beginning of period 161,770 161,019
End of period $ 95,208 $ 134,948