Basis of Presentation - Narrative (Details) - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities	$ 22,016,000	$ 21,528,000
Net cash provided by financing activities	$ 819,000	14,108,000
Accounting Standards Update 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities		258,000
Net cash provided by financing activities		$ (258,000)