Property and Equipment - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 87,677,000	$ 75,682,000
Accumulated depreciation and amortization	(51,499,000)	(40,428,000)
Total property and equipment, net	36,178,000	35,254,000
Depreciation and amortization	11,300,000	10,900,000	8,000,000
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	42,829,000	40,180,000
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	5,689,000	5,260,000
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	8,701,000	7,394,000
Purchased Software [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	28,920,000	20,199,000
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 1,538,000	$ 2,649,000