CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues:
Patient services	$ 24,279	$ 23,321	$ 73,894	$ 71,501
Research services	5,962	2,220	16,086	3,114
Product	1,633	1,499	6,416	6,920
Total revenues	31,874	27,040	96,396	81,535
Cost of revenues:
Patient services	8,734	9,098	26,325	27,882
Research services	2,696	997	8,203	1,312
Product	1,210	547	3,593	3,607
Total cost of revenues	12,640	10,642	38,121	32,801
Gross profit	19,234	16,398	58,275	48,734
Operating expenses:
General and administrative	8,959	7,969	27,564	24,276
Sales and marketing	6,708	6,476	19,737	18,655
Bad debt expense	1,427	3,195	5,861	9,066
Research and development	1,898	1,143	5,400	3,368
Integration, restructuring and other charges	3,077	741	6,820	1,744
Total expenses	22,069	19,524	65,382	57,109
Loss from operations	(2,835)	(3,126)	(7,107)	(8,375)
Other (loss) income, net	(97)	5	(211)	91
Loss before income taxes	(2,932)	(3,121)	(7,318)	(8,284)
Income tax (expense) benefit	(24)		(24)	431
Net loss and comprehensive loss	$ (2,956)	$ (3,121)	$ (7,342)	$ (7,853)
Net loss per common share:
Basic and diluted (in dollars per share)	$ (0.12)	$ (0.12)	$ (0.29)	$ (0.32)
Weighted average number of common shares outstanding:
Basic and diluted (in shares)	25,616,417	24,995,449	25,449,554	24,839,752