Significant Accounting Policies - Additional Information (Detail)	6 Months Ended	12 Months Ended
	Jun. 30, 2015 USD ($)	Dec. 31, 2016 USD ($) Segment shares	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($)	May 31, 2016 shares
Significant Accounting Policies [Line Items]
Common stock, shares issued | shares		75,862,946	58,182,000
Decrease in the fair value of warrant liability		$ 4,800,000
Accounts receivable		1,027,000	$ 4,641,000
Depreciation expense		30,000	9,600,000	$ 6,200,000
Impairment losses		0	200,000	7,600,000
Tax benefits of the stock based compensation expenses recognized		$ 0
Number of operating segments | Segment		1
United Kingdom
Significant Accounting Policies [Line Items]
Net assets located in the United Kingdom		$ 800,000	1,000,000
Leasehold Improvements
Significant Accounting Policies [Line Items]
Depreciation expense				$ 2,400,000
3rd Amendment, Lease exit costs associated with 650 E. Kendall.
Significant Accounting Policies [Line Items]
Leased space surrendering date		May 29, 2015
3rd Amendment, Lease exit costs associated with 650 E. Kendall. | Leasehold Improvements
Significant Accounting Policies [Line Items]
Additional charge to depreciation expense due to revision of estimated useful life	$ 2,900,000		$ 2,900,000
Biodesix
Significant Accounting Policies [Line Items]
Accounts receivable		$ 800,000
Minimum
Significant Accounting Policies [Line Items]
Marketable securities maturity term		3 months
Maximum
Significant Accounting Policies [Line Items]
Marketable securities maturity term		24 months
PIPE Warrants [Member] | Private Placement
Significant Accounting Policies [Line Items]
Common stock, shares issued | shares					17,642,482