Intangible Assets - Classes of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
COST	$ 2,982	$ 2,982
Accumulated Amortization	349	182
Total	2,633	2,800
Support Vector Machine (SVM) Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	108 months	108 months
COST	500	500
Accumulated Amortization	98	56
Total	402	444
Laboratory Developed Test (LDT) Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	164 months	164 months
COST	1,482	1,482
Accumulated Amortization	161	81
Total	1,321	1,401
Flow Cytometry and Cytogenetics Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	202 months	202 months
COST	1,000	1,000
Accumulated Amortization	90	45
Total	$ 910	$ 955