CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Cash flows from operating activities:
Net (loss) income	$ (39,119)	$ 4,410	$ (42,572)
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation and amortization	565	545	939
(Gains) losses on sales of fixed assets	(2)	(110)	204
Intangible impairment charge	0	2,676	919
Deferred income tax	(133)	(989)	(362)
Change in contingent consideration liability	1,600	1,500	(200)
Expenses for share-based compensation awards	2,948	3,523	3,546
Acquisition of subsidiary escrow shares returned	0	(82)	0
Changes in assets and liabilities:
(Increase) decrease in accounts receivable	(3,415)	2,770	4,114
(Increase) decrease in other current assets	(3,058)	(572)	336
(Increase) decrease in deferred tax and other assets	(1,535)	0	2,044
Increase (decrease) in accounts payable and accrued expenses	2,152	58	(1,956)
(Decrease) in deferred revenue - current	0	0	(886)
(Decrease) in deferred tax and other current liabilities	(60)	0	(2,069)
(Decrease) in other liabilities	(80)	(3)	(164)
Net cash (used in) provided by operating activities	(40,137)	13,726	(36,107)
Cash flows from investing activities:
Acquisition of subsidiary, net of cash acquired	(6,202)	0	0
Cash acquired in acquisition of subsidiary	0	0	1,888
Capital expenditures	(370)	(714)	(137)
Proceeds from sales of fixed assets	48	143	174
Proceeds from redemption of auction rate securities	0	2,400	1,100
Net cash (used in) provided by investing activities	(6,524)	1,829	3,025
Cash flows from financing activities:
Purchase of noncontrolling interests	(292)	0	0
Equity issuance costs in connection with acquisition of subsidiary	0	0	(45)
Proceeds from public offering of common stock, net of underwriting discounts and commissions and offering expenses	0	37,459	40,078
Proceeds from the exercise of stock options	1,737	428	71
Net cash provided by financing activities	1,445	37,887	40,104
Effect of exchange rate changes on cash	17	0	0
Net (decrease) increase in cash and cash equivalents	(45,199)	53,442	7,022
Cash and cash equivalents at beginning of period	119,302	65,860	58,838
Cash and cash equivalents at end of period	74,103	119,302	65,860
Supplemental Cash Flow Elements [Abstract]
Contingent consideration liability	$ 18,800	$ 17,200	15,700
Stock acquisition consideration			$ 11,265