Leases - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Mar. 31, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Operating lease, right-of-use asset	$ 27,532	$ 30,000	$ 30,000
Operating lease liability	29,100	$ 31,000	$ 31,000
Operating lease liability, current	7,600
Operating lease liability, noncurrent	$ 21,500
Weighted average minimum lease term	2 years 7 months 6 days
Weighted average discount rate	6.93%
Finance lease, depreciation expense	$ 500
Finance lease, interest expense	100
Total operating lease costs	12,500
Cash paid, lease liabilities, operating leases	8,600
Cologne, Germany
Lessee, Lease, Description [Line Items]
Undiscounted future lease payments	$ 35,000
Undiscounted future lease payments, term of lease	20 years