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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Operating activities:    
Net income (loss) $ (41,004) $ (29,898)
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, Depletion and Amortization 4,973 4,771
Amortization of Financing Costs and Discounts 3,166 2,971
Share-based compensation 11,253 14,750
Deferred Income Tax Expense (Benefit) 42 116
Provision for doubtful accounts (139) 66
Changes in operating assets and liabilities:    
Accounts and unbilled receivables 2,480 10,817
Prepaid expenses and other assets (804) 1,508
Accounts payable (1,454) (1,715)
Accrued liabilities 640 129
Accrued payroll and other employee benefits (2,246) (6,324)
Deferred revenue 13,721 4,786
Net cash (used in) provided by operating activities (9,372) 1,977
Investing activities:    
Purchases of property and equipment (5,339) (1,850)
Internal-use software development costs capitalized (72) (233)
Payments to Acquire Short-term Investments 88,928 31,200
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities 49,500 20,000
Net cash (used in) provided by investing activities (44,839) (13,283)
Financing activities:    
Exercise of stock options 14 767
Proceeds from Stock Plans 470 382
Tax withholding related to net share settlement of restricted stock units (4,839) (4,728)
Repayments of Notes Payable (91) (159)
Payments of Debt Issuance Costs 0 (408)
Net cash (used in) provided by financing activities (4,446) (4,146)
Effect of Exchange Rate on Cash and Cash Equivalents 38 264
Net change in cash and cash equivalents (58,619) (15,188)
Cash and cash equivalents:    
Beginning of period 161,770 161,019
End of period $ 103,151 $ 145,831