Schedule II - Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 1,750	$ 407
Additions charged to Expense or Revenue	260	125
Deductions and write-offs	0	(6)
Balance at End of Period	2,010	526
Allowance for product returns
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	841	215
Additions charged to Expense or Revenue	709	201
Deductions and write-offs	(606)	(111)
Balance at End of Period	944	305
Allowance for obsolescence
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	527	322
Additions charged to Expense or Revenue	130	24
Deductions and write-offs	(105)	(23)
Balance at End of Period	$ 552	$ 323