Commitments and Contingencies - Future Minimum Lease Payments (Details) $ in Thousands	Mar. 31, 2018 USD ($)
Capital Leases
2018 (9 months remaining)	$ 254
2019	252
2020	61
2021	0
2022	0
Total minimum lease payments (1)	567
Less: amount representing interest	(26)
Present value of capital lease obligations	541
Less: current portion	(298)
Long-term portion of capital leases	243
Operating Leases
2018 (9 months remaining)	2,397
2019	3,280
2020	712
2021	490
2022	41
Total minimum lease payments (1)	$ 6,920