Commitments and Contingencies (Details) - USD ($)	1 Months Ended		12 Months Ended
	Jul. 31, 2015	Jul. 31, 2010	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Aug. 31, 2015
Other Commitments [Line Items]
Term of lease	96 months
Tenant incentive	$ 8,500,000					$ 1,400,000
Restricted cash			$ 0	$ 1,256,000		$ 1,400,000
Tenant improvement allowance used			8,200,000
Unused tenant imporvement allowance cap			400,000.0
Unused tenant improvement			300,000
Minimum period for early termination, in months		60 months
Minimum notice for early termination, in months		9 months
Future sublease income			200,000
Rent expense			1,200,000	600,000	$ 700,000
Deferred rent, less current portion			8,840,000	2,308,000
Prior Lease
Other Commitments [Line Items]
Other liabilities, current			200,000
Other Noncurrent Liabilities
Other Commitments [Line Items]
Deferred rent, less current portion			10,100,000	0
Other Noncurrent Liabilities | Prior Lease
Other Commitments [Line Items]
Deferred rent, less current portion			$ 0	$ 400,000.0