Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (2,585)	$ (2,603)
Adjustments to reconcile net loss to net cash provided by operating activities:
Non-cash revenue	(1,660)	(1,768)
Depreciation and amortization	454	3,039
Non-cash equity compensation	575	601
Deferred income tax expense / (benefit)	286	(54)
Other non-cash charges, net	22	535
Changes in operating assets and liabilities
Accounts receivable, net	18,236	19,899
Accounts payable and accrued liabilities and other	(5,905)	(599)
Accrued payroll and related costs	(3,679)	(3,491)
Other deferred revenue	(1,306)	1,116
Other changes	603	1,883
Total changes in operating assets and liabilities	7,949	18,808
Net cash provided by operating activities	5,041	18,558
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(100)	(305)
Purchases of short-term investments	(12,471)	(25,498)
Sales of short-term investments	21,250	2,471
Net cash provided / (used in) by investing activities	8,679	(23,332)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds received from stock option exercises	61	890
Shares withheld in payment of employee tax obligations	(107)	0
Change in restricted cash	0	14
Net cash (used in) / provided by financing activities	(46)	904
Net increase / (decrease) in cash and cash equivalents	13,674	(3,870)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	11,439	21,884
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 25,113	$ 18,014