Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Fair Value Disclosures [Abstract]

Fair Value, by Balance Sheet Grouping [Table Text Block]

The valuation methodologies used for the Company's financial instruments measured on a recurring basis at fair value, including the general classification of such instruments pursuant to the valuation hierarchy, is set forth in the tables below.

	As of December 31, 2014				Fair Value Measurements
	Carrying		Fair		As of December 31, 2014
	Amount		Value		Level 1		Level 2		Level 3
Assets:
Cash and cash equivalents:
Cash	$	6,836	$	6,836	$	6,836	$	—	$	—
Money market funds	16,275		16,275		16,275		—		—
	$	23,111	$	23,111	$	23,111	$	—	$	—
Marketable securities:
Money market funds	$	48	$	48	$	48	$	—	$	—
Mutual funds	59		59		59		—		—
U.S. Treasury securities	1,070		1,070		1,070		—		—
Government agency securities	317		317		317		—		—
	$	1,494	$	1,494	$	1,494	$	—	$	—
Liabilities:
Contingent consideration:
Asuragen	$	4,476	$	4,476	$	—	$	—	$	4,476
RedPath	22,066		22,066		—		—		22,066
	$	26,542	$	26,542	$	—	$	—	$	26,542

	As of December 31, 2013				Fair Value Measurements
	Carrying		Fair		As of December 31, 2013
	Amount		Value		Level 1		Level 2		Level 3
Assets:
Cash and cash equivalents:
Cash	$	10,315	$	10,315	$	10,315	$	—	$	—
Money market funds	35,324		35,324		35,324		—		—
	$	45,639	$	45,639	$	45,639	$	—	$	—
Marketable securities:
Money market funds	$	48	$	48	$	48	$	—	$	—
Mutual funds	55		55		55		—		—
U.S. Treasury securities	1,730		1,730		1,730		—		—
Government agency securities	382		382		382		—		—
	$	2,215	$	2,215	$	2,215	$	—	$	—

Fair Value Measurements, Nonrecurring [Table Text Block]

The following table summarizes these assets of the Company measured at fair value on a nonrecurring basis as of December 31, 2014:

			Fair Value Measurements as of
	Carrying Amount as of		December 31, 2014
	December 31, 2014		Level 1		Level 2		Level 3
Long-lived assets held and used:
Thyroid	$	522	$	—	$	—	$	522
Pancreas	8,519		—		—		8,519
Biobank	2,728		—		—		2,728
Pancreas test	1,428		—		—		1,428
Barrett's test	15,756		—		—		15,756
CLIA lab	18,351		—		—		18,351
	$	47,304	$	—	$	—	$	47,304