Summary of Significant Accounting Policies (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended
	Jul. 02, 2013	Jul. 02, 2013 IPO - conversion of mandatorily redeemable convertible preferred stock	Jul. 02, 2013 Common Stock IPO - conversion of mandatorily redeemable convertible preferred stock	Jan. 02, 2013 Common Stock IPO - conversion of mandatorily redeemable convertible preferred stock Pro Forma	Jul. 02, 2013 Common Stock IPO - conversion of mandatorily redeemable convertible preferred stock, Series F	Jul. 02, 2013 Common Stock IPO - conversion of Series II common stock	Jan. 02, 2013 Common Stock IPO - conversion of Series II common stock Pro Forma
Summary of Significant Accounting Policies
Common stock sold and issued in IPO (in shares)	7,500,000
Initial Public Offering and Pro Forma Presentation
Common stock issued against convertible stock (in shares)			34,172,316	34,172,316	5,549,989	1,052,464	1,052,464
Shares of common stock issued on conversion related to the ratchet provision					1,584,863
Number of warrants to purchase common stock, issued on conversion of warrants to purchase mandatorily redeemable convertible preferred stock	142,534
Warrants for purchase of mandatorily redeemable convertible preferred stock liability reclassified to additional paid-in capital		$ 790
Warrants for purchase of mandatorily redeemable convertible preferred stock liability reclassified to additional paid-in capital, portion due to change in fair value		$ 136