Other Balance Sheet Items - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) item	Dec. 31, 2014 USD ($)	Jul. 31, 2014 USD ($)
Cash received from promissory note	$ 5,100
Other long-term assets
Cash collateralized standby letter of credit associated with one lease	$ 1,200	$ 1,400
Number of leases associated with cash collateralized standby letter of credit | item	1
CoveritLive
Cash received from promissory note	$ 5,100
Promissory note, principle amount	5,600		$ 5,600
Promissory note, discount amount	$ 100