Commitments and Contingencies - Leases (Details) $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 01, 2017 USD ($) item	Jun. 30, 2015 ft²	Sep. 30, 2016 USD ($) ft²	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) ft²	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Operating Leases
Deferred rent			$ 216		$ 216		$ 149
Rent expense			500	$ 200	800	$ 400
Future minimum lease payments under noncancelable operating leases
Reminder of 2016			429		429
2017			825		825
2018			647		647
2019			647		647
2020			643		643
Thereafter			659		659
Total future minimum payments			3,850		3,850
Purchase commitments
Purchase commitment due within one year			3,600		3,600		$ 2,600
Purchase commitment due beyond one year			0		0
Sublease, San Clemente, California
Operating Leases
Area of space subleased | ft²		37,700
Lease, San Clemente, California | Forecast
Operating Leases
Lease term upon expiration of the sublease	5 years
Monthly rent	$ 42
Optional lease extension term	3 years
Lease, San Clemente, California | Forecast | Minimum
Operating Leases
Annual rent increase (as a percent)	2.50%
Lease, San Clemente, California | Forecast | Maximum
Operating Leases
Annual rent increase (as a percent)	3.50%
Number of lease renewal periods | item	2
Tenant improvement allowance	$ 264
Sublease, Fjord Ventures
Future minimum lease payments under noncancelable operating leases
Total future minimum payments			$ 294		$ 294
Foreign Subsidiaries Office Leases
Operating Leases
Area of leased space | ft²			2,000		2,000