Basis of Presentation - Acquisition of 5 Arches (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended			9 Months Ended
	Mar. 01, 2019	May 31, 2018	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Business Acquisition [Line Items]
Remeasurement gain			$ 0		$ 0	$ 2,441	$ 0
Contingent consideration			25,167			25,167		$ 0
5 Arches, LLC
Business Acquisition [Line Items]
Percent acquired	80.00%
Minority interest, percentage		20.00%
Payment of cash to acquire business	$ 13,000
Contingent consideration maximum amount	27,000
Contingent consideration performance term		2 years
Remeasurement gain				$ 2,000
Intangible assets	24,800
Goodwill	28,747		28,747			28,747		$ 0
Goodwill deductible for tax purposes	3,000
Contingent consideration	$ 24,621		$ 25,000			25,000
Revenue						12,000
Net loss						3,000
Intangible assets amortization expense						$ 4,000
5 Arches, LLC
Business Acquisition [Line Items]
Payments to acquire equity method investment		$ 10,000
Option to purchase additional equity, term		1 year