Leases - Balance Sheet Classification of Lease Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Lease, Assets And Liabilities, Lessee [Abstract]
Operating lease assets	$ 22,097	$ 21,200
Other current liabilities	4,851
Operating lease liabilities	18,567
Present value of lease liabilities	23,418	22,200	$ 23,418
Finance Lease, Assets And Liabilities, Lessee [Abstract]
Right-of-use assets	987
Accumulated depreciation	(162)
Right-of-use assets, net	825
Current liabilities	375
Non-current liabilities	432
Total finance lease liabilities	$ 807		$ 807
Weighted Average Remaining Lease Term [Abstract]
Operating leases	5 years
Finance leases	2 years 11 months
Leases, Weighted Average Discount Rate [Abstract]
Operating leases	11.00%
Finance leases	7.40%
Before Adoption
Operating Lease, Assets And Liabilities, Lessee [Abstract]
Operating lease assets		20,400
After Adoption
Operating Lease, Assets And Liabilities, Lessee [Abstract]
Operating lease assets		3,800
Finance Lease, Assets And Liabilities, Lessee [Abstract]
Accumulated depreciation		$ (2,100)