Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 17,248	$ 17,248
Operating lease liabilities	17,248	17,248
Variable lease cost	300	800
Prepaid rent	$ 100	$ 100
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets			$ 20,800
Operating lease liabilities			$ 20,800
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Renewal term	1 year	1 year
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Renewal term	5 years	5 years