Initial Public Offering (IPO) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended			0 Months Ended
	Mar. 31, 2013	Sep. 30, 2012	Apr. 02, 2012	Apr. 02, 2012 IPO
Class of Stock [Line Items]
Sale of stock, transaction date				Apr. 02, 2012
Number of shares sold by the Company				950,000
Common stock, offering price				$ 19.00
Net proceeds from IPO				$ 11.1
Underwriting discounts and commissions				1.3
Offering expenses	$ 0.5	$ 0.7		$ 5.6
Number of shares sold to shareholders				4,800,000
Outstanding shares of convertible preferred stock converted into number of shares of common stock			15,221,571
Reclassified common stock and the related convertible preferred stock warrant liability to additional paid-in capital			80,560