Acquisitions - Additional Information (Detail) - USD ($)		12 Months Ended
	Dec. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 28, 2015	Dec. 27, 2015	Jul. 08, 2014
Business Acquisition [Line Items]
Common stock, shares authorized		250,000,000	100,000,000		250.0	100.0
Preferred stock, shares authorized					50.0	10.0
Amortization of intangibles		$ 412,000	$ 295,000	$ 223,000
Debt issuance costs		$ 2,218,000
GE Medical [Member]
Business Acquisition [Line Items]
Ownership percentage upon conversion of preferred stock		32.00%
Revolving Credit Facility [Member]
Business Acquisition [Line Items]
Debt issuance costs		$ 1,100,000
Clarient, Inc. [Member]
Business Acquisition [Line Items]
Business acquisition, purchase price in cash payment	$ 73,800,000
Payment for working capital adjustment	$ 6,700,000
Business acquisition, purchase price payment in share	15,000,000
Discount due to lack of marketability of the common stock, percent	15.00%
Fair value of preferred stock consideration	$ 102,510,000
Fair value of preferred stock	$ 8.04
Acquired intangible assets	$ 84,000,000
Amortization of intangibles		36,000
Provisional fair value of accounts receivable acquired		27,600,000
Debt issuance costs		3,351,000
Business acquisition purchase price	248,074,000
Clarient, Inc. [Member] | General and Administrative Expense [Member]
Business Acquisition [Line Items]
Acquisition related transaction costs		$ 4,700,000
Clarient, Inc. [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired intangible assets	81,000,000
Intangible asset amortization period		15 years
Clarient, Inc. [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Acquired intangible assets	3,000,000
Intangible asset amortization period		2 years
Clarient, Inc. [Member] | Revolving Credit Facility [Member]
Business Acquisition [Line Items]
Business acquisition, purchase price in cash payment	9,500,000
Clarient, Inc. [Member] | Term Loan [Member]
Business Acquisition [Line Items]
Business acquisition, purchase price in cash payment	53,600,000
Clarient, Inc. [Member] | Cash on Hand [Member]
Business Acquisition [Line Items]
Business acquisition, purchase price in cash payment	$ 10,700,000
Clarient, Inc. [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Business acquisition, purchase price payment in share	15,000,000
Clarient, Inc. [Member] | Series A Preferred Stock [Member]
Business Acquisition [Line Items]
Business acquisition, purchase price payment in share	14,666,667
Fair value of preferred stock consideration	$ 73,200,000
Fair value of preferred stock	$ 4.99
Carrying amount of preferred stock	$ 28,602,000
Path Logic [Member]
Business Acquisition [Line Items]
Acquired intangible assets							$ 1,930,000
Amortization of intangibles		$ 148,000	$ 71,000
Business acquisition purchase price							$ 5,908,000
Goodwill expected tax deductible amount		$ 3,700,000
Goodwill amortization period for tax purposes		15 years
Path Logic [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible asset amortization period		13 years
Acquired intangible assets		$ 1,930,000