Significant Accounting Policies - Advertising Costs (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Advertising expense	$ 3,800,000	$ 1,300,000	$ 700,000
Shipping, Handling and Transportation Costs	$ 0	$ 100,000	$ 1,900,000