Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018	Jan. 01, 2019	Dec. 31, 2018
Leases [Abstract]
Operating Lease, Liability	$ 17,984		$ 17,984
Operating lease, right-of-use asset	17,928		17,928		$ 17,522	$ 0
Operating lease, liability, current	5,835		5,835		4,736	0
Operating lease, liability, noncurrent	12,149		12,149		$ 12,669	$ 0
Operating lease, cost	1,742		3,227
Operating lease, payments	1,669		3,070
Lease, cost	$ 64		$ 233
Operating Lease, Weighted Average Discount Rate, Percent	480.00%		480.00%
Operating Lease, Weighted Average Remaining Lease Term	3 years 7 months 6 days		3 years 7 months 6 days
Operating Lease, Lease Income	$ 81	$ 83	$ 158	$ 159