Commitments and Contingencies - Future Minimum Lease Payments (Details) $ in Thousands	Jun. 30, 2018 USD ($)
Capital Leases
2018 (remaining 6 months)	$ 126
2019	252
2020	61
2021	0
2022	0
Total minimum lease payments (1)	439
Less: amount representing interest	(19)
Present value of capital lease obligations	420
Less: current portion	(237)
Long-term portion of capital leases	183
Operating Leases
2018 (remaining 6 months)	1,598
2019	3,280
2020	712
2021	490
2022	41
Total minimum lease payments (1)	$ 6,121