Summary of Significant Accounting Policies (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	9 Months Ended
	Jul. 02, 2013	Sep. 30, 2013
Summary of Significant Accounting Policies
Common stock sold and issued in IPO (in shares)	7,500,000
Initial Public Offering
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
IPO - conversion of mandatorily redeemable convertible preferred stock
Initial Public Offering
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
IPO - conversion of mandatorily redeemable convertible preferred stock, Series F
Initial Public Offering
Common stock issued in connection with the one-time non-cash preferred stock deemed dividend	$ 15,849
Common Stock | IPO - conversion of mandatorily redeemable convertible preferred stock
Initial Public Offering
Common stock issued against convertible stock (in shares)	34,172,316
Common Stock | IPO - conversion of mandatorily redeemable convertible preferred stock, Series F
Initial Public Offering
Common stock issued against convertible stock (in shares)	5,549,989
Shares of common stock issued on conversion related to the ratchet provision	1,584,863
Common Stock | IPO - conversion of Series II common stock
Initial Public Offering
Common stock issued against convertible stock (in shares)	1,052,464