Organization and Significant Accounting Policies - Revenue Recognition and Sales and Marketing Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Revenue recognition, customer contract period, min	3 months
Revenue recognition, customer contract period, max	36 months
Sales commissions amortization period	12 months
Advertising expense	$ 2,800	$ 1,800	$ 454