Summary of Significant Accounting Policies (Details) - USD ($)		3 Months Ended	9 Months Ended		12 Months Ended
	Jan. 01, 2016	Mar. 31, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Recent Accounting Pronouncements
Impact on retained earnings for minimum statutory withholding tax requirement due to amendments	$ 0		$ 1,304,000		$ 937,000
Excess tax benefit of stock-based compensation, financing activities				$ 747,000
Accounting Standards Update 2016-09 | Adjustments for New Accounting Principle, Early Adoption
Recent Accounting Pronouncements
Effect of share-based compensation of excess tax benefit in provision for income taxes	100,000
Excess tax benefit of stock-based compensation, operating activities		$ 100,000
Excess tax benefit of stock-based compensation, financing activities		$ (100,000)
Accounting Standards Update 2016-09 | Adjustments for New Accounting Principle, Early Adoption | Maximum
Recent Accounting Pronouncements
Cumulative effect adjustment to retained earnings for increase to stock compensation expense	$ (100,000)