Segment Reporting - Net Sales by Product and Services (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting
Product net sales									$ 241,609	$ 159,220	$ 101,360
Services net sales									132,501	101,786	95,010
Total net sales	$ 93,567	$ 107,697	$ 95,536	$ 77,310	$ 87,865	$ 77,374	$ 53,236	$ 42,531	$ 374,110	$ 261,006	$ 196,370