Commitments and Contingencies - Future Minimum Lease Payments (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Capital Leases
2018 (remaining 3 months)	$ 62
2019	252
2020	61
2021	0
2022	0
Total minimum lease payments	375
Less: amount representing interest	(15)
Present value of capital lease obligations	360
Less: current portion	(238)
Long-term portion of capital leases	122
Operating Leases
2018 (remaining 3 months)	799
2019	3,280
2020	712
2021	490
2022	41
Total minimum lease payments	$ 5,322