Long-term Obligations - San Diego Lease (Details) ft² in Thousands, $ in Thousands	Dec. 02, 2015 USD ($) ft² term_extension	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Property, Plant and Equipment [Line Items]
Property and equipment, net		$ 740,103	$ 698,362
San Diego Lease
Property, Plant and Equipment [Line Items]
Area of real estate property (in square feet) | ft²	170
Length of lease	16 years
Average yearly aggregate rent	$ 10,200
Amount of optional renewal terms | term_extension	2
Optional renewal term length	5 years
San Diego Lease | Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, net		57,100	15,000
San Diego Lease | Buildings
Property, Plant and Equipment [Line Items]
Construction financing lease obligation, current and noncurrent		$ 50,200	$ 12,600