Leases - Schedule of Components of Operating Lease Expense (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Lease Cost [Abstract]
Operating lease cost, gross		$ 2,139	$ 1,780	$ 6,311	$ 5,525
Variable lease cost, gross	[1]	806		2,135
Sublease income		(145)		(290)
Total lease costs	[2]	$ 2,800	$ 1,780	$ 8,156	$ 5,525

[1] Variable rent expense was not included within the measurement of the Company's operating right-of-use assets and lease liabilities. Variable rent expense is comprised primarily of the Company's proportionate share of operating expenses, property taxes and insurance and is classified as lease expense due to the Company's election to not separate lease and non-lease

[2] Short-term lease costs for the three and nine months ended September 30, 2019 were not significant and are not included in the table above.