Commitments and Contingencies - Additional Information (Details)			3 Months Ended		6 Months Ended
	Sep. 15, 2014 USD ($) ft²	Jun. 29, 2012 USD ($) ft²	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Commitments And Contingencies Disclosure [Line Items]
Purchase commitment cancellation notice period					30 days
Deposits for letter of credit			$ 300,000		$ 300,000
Rent expense net			400,000	$ 700,000	400,000	$ 700,000
Contingent liability for accrual			0		0		$ 0
Facility Leases
Commitments And Contingencies Disclosure [Line Items]
Lease period	5 years	66 months
Area of leased property | ft²	34,400	12,000
Annual lease payments		$ 500,000
Sublease income			100,000	100,000	200,000	200,000
Sublease expense			$ 100,000	$ 100,000	$ 200,000	$ 200,000
Additional period of extension in lease contract	3 years
Initial annual lease payments	$ 1,300,000
Increase in lease payments at final year of agreement	$ 1,600,000
Lease commencement period					2015-01
Lease abatement period	3 months