CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net loss	$ (21,951)	$ (20,386)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	261	277
Gains on sales of fixed assets	(18)	(73)
Deferred income tax	0	(1)
Change in contingent consideration liability	1,100	900
Expenses for share-based compensation awards	2,211	2,251
Acquisition of subsidiary escrow shares returned	0	(82)
Changes in assets and liabilities:
(Increase) decrease in accounts receivable	(1,300)	1,411
(Increase) in other current assets	(117)	0
(Decrease) in accounts payable and accrued expenses	(54)	(2,275)
(Decrease) in other liabilities	(25)	(2)
Net cash used in operating activities	(19,893)	(17,980)
Cash flows from investing activities:
Capital expenditures	(233)	(68)
Proceeds from sales of fixed assets	17	76
Net cash (used in) provided by investing activities	(216)	8
Cash flows from financing activities:
Proceeds from public offering of common stock, net of underwriting discounts and commissions and offering expenses	0	37,459
Proceeds from the exercise of stock options	116	0
Net cash provided by financing activities	116	37,459
Net (decrease) increase in cash and cash equivalents	(19,993)	19,487
Cash and cash equivalents at beginning of period	119,302	65,860
Cash and cash equivalents at end of period	$ 99,309	$ 85,347