Annual report pursuant to Section 13 and 15(d)

Quarterly Summary of Information (Unaudited) - Summary of Quarterly Unaudited Financial Data (Details)

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Quarterly Summary of Information (Unaudited) - Summary of Quarterly Unaudited Financial Data (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Selected Quarterly Financial Information [Abstract]                      
Net sales $ 29,118us-gaap_Revenues $ 29,393us-gaap_Revenues $ 30,393us-gaap_Revenues $ 23,633us-gaap_Revenues $ 19,762us-gaap_Revenues $ 19,777us-gaap_Revenues $ 20,157us-gaap_Revenues $ 15,747us-gaap_Revenues $ 112,537us-gaap_Revenues $ 75,443us-gaap_Revenues $ 48,576us-gaap_Revenues
Gross profit 13,816us-gaap_GrossProfit 14,649us-gaap_GrossProfit 15,114us-gaap_GrossProfit 11,938us-gaap_GrossProfit 10,175us-gaap_GrossProfit 9,642us-gaap_GrossProfit 11,057us-gaap_GrossProfit 8,117us-gaap_GrossProfit 55,517us-gaap_GrossProfit 38,991us-gaap_GrossProfit 23,949us-gaap_GrossProfit
Net income $ 1,519us-gaap_NetIncomeLoss $ 2,133us-gaap_NetIncomeLoss $ 2,286us-gaap_NetIncomeLoss $ 888us-gaap_NetIncomeLoss $ 21,971us-gaap_NetIncomeLoss $ 774us-gaap_NetIncomeLoss $ 1,960us-gaap_NetIncomeLoss $ 730us-gaap_NetIncomeLoss $ 6,826us-gaap_NetIncomeLoss $ 25,435us-gaap_NetIncomeLoss $ 564us-gaap_NetIncomeLoss
Net income (loss) per share attributable to common stockholders                      
Net income (loss) per share - basic common stock $ 0.08us-gaap_EarningsPerShareBasic $ 0.12us-gaap_EarningsPerShareBasic $ 0.13us-gaap_EarningsPerShareBasic $ (0.01)us-gaap_EarningsPerShareBasic $ 0.91us-gaap_EarningsPerShareBasic $ (3.90)us-gaap_EarningsPerShareBasic   $ (3.65)us-gaap_EarningsPerShareBasic $ 0.33us-gaap_EarningsPerShareBasic $ 0.76us-gaap_EarningsPerShareBasic $ (19.97)us-gaap_EarningsPerShareBasic
Net income (loss) per share - diluted common stock $ 0.07us-gaap_EarningsPerShareDiluted $ 0.11us-gaap_EarningsPerShareDiluted $ 0.11us-gaap_EarningsPerShareDiluted $ (0.01)us-gaap_EarningsPerShareDiluted $ 0.79us-gaap_EarningsPerShareDiluted $ (3.90)us-gaap_EarningsPerShareDiluted   $ (3.65)us-gaap_EarningsPerShareDiluted $ 0.30us-gaap_EarningsPerShareDiluted $ 0.68us-gaap_EarningsPerShareDiluted $ (19.97)us-gaap_EarningsPerShareDiluted