Debt - Future Minimum Principal Payments (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jul. 28, 2017	Dec. 31, 2016
Debt Instrument, Redemption [Line Items]
Remainder 2017	$ 264
2018	970
Seven months ended July 31, 2019	862
Total	2,096	$ 2,200
Western Alliance Bank
Debt Instrument, Redemption [Line Items]
Remainder 2017	200
2018	400
Seven months ended July 31, 2019	400
Total	1,000		$ 0
Super G
Debt Instrument, Redemption [Line Items]
Remainder 2017	64
2018	570
Seven months ended July 31, 2019	462
Total	$ 1,096	$ 1,100	$ 0