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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating activities:      
Net Income (Loss) Attributable to Parent $ (64,246) $ (77,926) $ (75,225)
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation, Depletion and Amortization 13,055 10,531 9,507
Amortization of Financing Costs and Discounts 12,027 9,264 6,439
Share-based compensation 21,453 22,796 20,466
Deferred income tax (463) (520) 40
Provision for doubtful accounts 212 0 174
Gain (Loss) on Disposition of Assets 37 59 19
Changes in operating assets and liabilities:      
Accounts and unbilled receivables (9,550) 2,022 5,671
Increase (Decrease) in Other Operating Assets (4,086) 0 0
Prepaid expenses and other assets 87 (3,715) (915)
Accounts payable 3,931 700 (2,905)
Accrued liabilities 2,764 (1,055) 2,801
Accrued payroll and other employee benefits 5,830 (2,344) 5,195
Deferred revenue 24,652 14,875 14,388
Net cash (used in) provided by operating activities 5,703 (25,313) (14,345)
Investing activities:      
Purchases of property and equipment (1,475) (1,286) (7,241)
Payments to Acquire Other Investments (45) 0 (2,000)
Payments to Acquire Businesses, Net of Cash Acquired 0 (34,130) 0
Capitalized Software Development Costs for Software Sold to Customers (4,613) (2,797) (1,048)
Payments to Acquire Intangible Assets (125) (125) (1,625)
Payments to Acquire Short-term Investments 0 0 (154,990)
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities 0 15,992 141,500
Net cash (used in) provided by investing activities (6,258) (22,346) (25,404)
Financing activities:      
Exercise of stock options 1,142 6,331 889
Proceeds from Stock Plans 1,720 1,535 1,090
Tax withholding related to net share settlement of restricted stock units (9,410) (7,375) (5,467)
Proceeds from Issuance of Common Stock 141,954 0 0
Repayments of Notes Payable (54) (209) (196)
Proceeds from Convertible Debt 0 93,500 0
Net cash (used in) provided by financing activities 135,352 90,654 (3,684)
Effect of Exchange Rate on Cash and Cash Equivalents 174 (529) (298)
Net change in cash and cash equivalents 134,971 42,466 (43,731)
Cash and cash equivalents:      
Beginning of period 160,505 118,039 161,770
End of period 295,476 160,505 118,039
Income Taxes Paid, Net (262) (271) 968
Interest Paid (5,252) (4,013) (3,182)
Capital Expenditures Incurred but Not yet Paid 247 38 378
Convertible Debt [Member]      
Financing activities:      
Payments of Debt Issuance Costs 0 (2,978) 0
Revolving Credit Facility [Member]      
Financing activities:      
Payments of Debt Issuance Costs $ 0 $ (150) $ 0