CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net loss	$ (9,313)	$ (11,258)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	144	277
Gains on sales of fixed assets	(43)	(75)
Change in contingent consideration liability	500	0
Expenses for share-based compensation awards	773	749
Changes in assets and liabilities:
Decrease in accounts receivable	2,062	5,402
(Increase) decrease in other current assets	(905)	440
(Increase) in other assets	(1)	0
(Decrease) in accounts payable and accrued expenses	(2,531)	(630)
(Decrease) in deferred revenue - current	0	(460)
(Decrease) increase in other liabilities	(1)	4
Net cash used in operating activities	(9,315)	(5,551)
Cash flows from investing activities:
Cash acquired in acquisition of subsidiary	0	1,888
Capital expenditures	(10)	(35)
Proceeds from sales of fixed assets	46	86
Proceeds from redemption of auction rate securities	0	100
Net cash provided by investing activities	36	2,039
Cash flows from financing activities:
Equity issuance costs in connection with acquisition of subsidiary	0	(45)
Proceeds from public offering of common stock, net of underwriting discounts and commissions and offering expenses	37,455	0
Proceeds from the exercise of stock options	0	3
Net cash provided by (used in) financing activities	37,455	(42)
Net increase (decrease) in cash and cash equivalents	28,176	(3,554)
Cash and cash equivalents at beginning of period	65,860	58,838
Cash and cash equivalents at end of period	94,036	55,284
Supplemental disclosure of cash flow information:
Contingent consideration liability	16,200	15,900
Stock acquisition consideration		$ 11,265