Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 1,750	$ 407	$ 49
Additions charged to Expense or Revenue	1,698	1,357	391
Deductions and write-offs	(178)	(14)	(33)
Balance at End of Year	3,270	1,750	407
Allowance for product returns
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	841	215	89
Additions charged to Expense or Revenue	3,257	2,215	917
Deductions and write-offs	(2,836)	(1,589)	(791)
Balance at End of Year	1,262	841	215
Allowance for obsolescence
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	527	322	159
Additions charged to Expense or Revenue	540	405	213
Deductions and write-offs	(670)	(200)	(50)
Balance at End of Year	$ 397	$ 527	$ 322