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Related Party Transactions (Details) - USD ($) $ in Thousands	1 Months Ended				3 Months Ended		9 Months Ended
	Mar. 31, 2017	Nov. 30, 2016	Feb. 28, 2014	Mar. 31, 2013	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Related Party Transaction [Line Items]
Interest expense					$ 1,282	$ 1,005	$ 3,826	$ 2,925
Chief Financial Officer
Related Party Transaction [Line Items]
Stockholders’ notes receivable				$ 200
Stockholders' note interest rate (percent)				1.09%
Repayment of stockholders’ notes receivable		$ 100
Chief Executive Officer
Related Party Transaction [Line Items]
Stockholders’ notes receivable			$ 400
Stockholders' note interest rate (percent)			1.97%
Chief Executive Officer | Forgiveness of Related Party Promissory Note
Related Party Transaction [Line Items]
Notes receivable forgiven	$ 200
Notes receivable percentage of principal approved for forgiveness	50.00%
Stock-based compensation expense	$ 400
Interest expense	$ 100

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