Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Jun. 29, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 01, 2018	May 31, 2015
Summary Of Significant Accounting Policies [Line Items]
Stock based compensation expenses		$ 8,454	$ 8,452	$ 7,997
Weighted average fair value of stock option granted		$ 3.94	$ 4.43	$ 10.47
Stock Options
Summary Of Significant Accounting Policies [Line Items]
Stock based compensation expenses		$ 2,500	$ 3,000	$ 5,300
Restricted Stock
Summary Of Significant Accounting Policies [Line Items]
Stock based compensation expenses		6,000	5,500	$ 2,700
Current Assets | Lease Obligations
Summary Of Significant Accounting Policies [Line Items]
Restricted cash		388
Other Noncurrent Assets | Line of Credit
Summary Of Significant Accounting Policies [Line Items]
Restricted cash		104
ARES Trading License
Summary Of Significant Accounting Policies [Line Items]
Deferred revenue		$ 41,500	$ 47,900			$ 57,500
Minimum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment useful life		3 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment useful life		5 years
Accumulated Deficit
Summary Of Significant Accounting Policies [Line Items]
Cumulative effect adjustment		$ (122)
ASU 2014-09 | Subsequent Event
Summary Of Significant Accounting Policies [Line Items]
Deferred revenue					$ 8,100
ASU 2014-09 | Subsequent Event | Accumulated Deficit
Summary Of Significant Accounting Policies [Line Items]
Cumulative effect adjustment					$ (8,100)
Adjustments for New Accounting Pronouncement | ARES Trading License
Summary Of Significant Accounting Policies [Line Items]
Transaction price allocated to performance obligations		$ 57,500
Intrexon Corporation/Precigen | Series 1 Preferred Stock
Summary Of Significant Accounting Policies [Line Items]
Issuance of stock in a license agreement (in shares)	100,000	13,460
Number of shares converted into common stock		34,134,524
Preferred stock, conversion rate		$ 1.00