Rent Expense (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014
Auburn, Washington
Rent Expense [Line Items]
Rent expense	$ 27,000
Lease Expiration Period Description	Month to Month
Baton Rouge, Louisiana
Rent Expense [Line Items]
Rent expense	15,000
Lease Expiration Date	Mar. 31, 2015
Brentwood, Tennessee
Rent Expense [Line Items]
Rent expense	70,000
Lease Expiration Period Description	Month to Month
Champaign, Illinois
Rent Expense [Line Items]
Rent expense	340,000
Lease Expiration Date	Dec. 31, 2017
Charlotte, North Carolina
Rent Expense [Line Items]
Rent expense	63,000
Lease Expiration Date	Mar. 31, 2016
Escondido, California
Rent Expense [Line Items]
Rent expense	42,000
Lease Expiration Period Description	Month to Month
Hampstead, New Hampshire
Rent Expense [Line Items]
Rent expense	28,000
Lease Expiration Date	Aug. 31, 2017
Nashville, Tennessee
Rent Expense [Line Items]
Rent expense	143,000
Lease Expiration Date	Feb. 29, 2016
Ontario, California
Rent Expense [Line Items]
Rent expense	85,000
Lease Expiration Date	Dec. 31, 2018
Pearl River, New York
Rent Expense [Line Items]
Rent expense	93,000
Lease Expiration Date	Aug. 31, 2018
Pottsboro, Texas
Rent Expense [Line Items]
Rent expense	10,000
Lease Expiration Date	Aug. 31, 2017
San Juan, Puerto Rico
Rent Expense [Line Items]
Rent expense	53,000
Lease Expiration Period Description	Month to Month
Stony Point, New York
Rent Expense [Line Items]
Rent expense	116,000
Lease Expiration Date	Jun. 30, 2016
Tulsa, Oklahoma
Rent Expense [Line Items]
Rent expense	$ 26,000
Lease Expiration Date	Dec. 31, 2017