Acquisitions - Summary of Acquisition Date Fair Value of Common Stock Transferred (Detail) - Clarient, Inc. [Member] $ / shares in Units, $ in Thousands	Dec. 30, 2015 USD ($) $ / shares shares
Business Acquisition Equity Interests Issued Or Issuable [Line Items]
Shares of common stock issued as consideration | shares	15,000,000
Stock price per share on closing date | $ / shares	$ 8.04
Value of common stock issued as consideration	$ 120,600
Issue discount due to lack of marketability	(18,090)
Fair value of common stock at December 30, 2015	$ 102,510