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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Operating activities:    
Net income (loss) $ (20,477) $ (14,230)
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, Depletion and Amortization 2,465 2,395
Amortization of Financing Costs and Discounts 1,568 1,466
Share-based compensation 5,384 7,745
Deferred Income Tax Expense (Benefit) 27 0
Provision for doubtful accounts (96) (154)
Changes in operating assets and liabilities:    
Accounts and unbilled receivables 1,257 13,065
Prepaid expenses and other assets 458 754
Accounts payable 801 (1,918)
Accrued liabilities 1,034 474
Accrued payroll and other employee benefits (3,203) (9,304)
Deferred revenue 8,018 (1,727)
Net cash (used in) provided by operating activities (2,764) (1,434)
Investing activities:    
Purchases of property and equipment (3,522) (1,110)
Internal-use software development costs capitalized 0 (118)
Payments to Acquire Short-term Investments 34,946 12,487
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities 2,500 0
Net cash (used in) provided by investing activities (35,968) (13,715)
Financing activities:    
Exercise of stock options 0 256
Proceeds from Stock Plans 470 382
Tax withholding related to net share settlement of restricted stock units (4,797) (4,319)
Repayments of Notes Payable (38) (107)
Payments of Debt Issuance Costs 0 (408)
Net cash (used in) provided by financing activities (4,365) (4,196)
Effect of Exchange Rate on Cash and Cash Equivalents 27 (14)
Net change in cash and cash equivalents (43,070) (19,359)
Cash and cash equivalents:    
Beginning of period 161,770 161,019
End of period $ 118,700 $ 141,660