Accounts Receivable, Net - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for doubtful accounts	$ 648	$ 276	$ 1,371
Reserve for product returns	2,071	1,559	1,863
Hardware and Other Revenue
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reserve for product returns	$ 2,100	$ 1,600	$ 1,900