Leases - Balance Sheet Classification and Other Information (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Balance Sheet Classification [Abstract]
Long-term lease liabilities	$ 5,012	$ 0
Total operating lease liabilities	$ 7,053
Other Information [Abstract]
Weighted-average remaining term for operating leases	6 years 10 months 24 days
Weighted -average discount rate for operating leases	8.81%
Accounts Payable and Accrued Liabilities [Member]
Balance Sheet Classification [Abstract]
Current lease liabilities (recorded in Accrued expenses and other current liabilities)	$ 2,041