Acquisitions - Additional Information (Detail) - USD ($)		12 Months Ended
	Dec. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 28, 2015	Dec. 27, 2015
Business Acquisition [Line Items]
Common stock, shares authorized		250,000,000	250,000,000		250,000,000	100,000,000
Preferred stock, shares authorized					50,000,000	10,000,000
Redeemable Convertible Preferred Stock, shares outstanding		6,600,000	14,666,667
Amortization of intangibles		$ 7,272,000	$ 412,000	$ 295,000
GE Medical [Member]
Business Acquisition [Line Items]
Ownership percentage upon conversion of preferred stock		32.00%
Ownership percentage upon redemption of shares		25.00%
Series A Redeemable Convertible Preferred Stock [Member]
Business Acquisition [Line Items]
Redeemable Convertible Preferred Stock, shares outstanding		6,600,000
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		$ 7,300,000	36,000
Goodwill, expected to be deductible for income tax purposes		$ 0
Fair value of accounts receivable acquired	28,800,000
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 Redeemable Convertible 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	$ 28,600,000
Temporary equity, shares redemption		8,066,667
Redeemable Convertible Preferred Stock, shares outstanding		6,600,000