Loan and Security Agreement (Details) (USD $)	0 Months Ended				0 Months Ended	6 Months Ended		0 Months Ended		0 Months Ended
	Jun. 11, 2014	May 30, 2014	Jun. 30, 2014	Dec. 31, 2013	May 30, 2014 Series B-2	Jun. 30, 2014 Series B-2	Feb. 14, 2014 Series B-2	Jun. 11, 2014 Series B-2 Maximum	Feb. 14, 2014 Series B-2 Maximum	May 30, 2014 Initial Term Loan item	May 30, 2014 Second Term Loan
Loan and Security Agreement
Aggregate principal amount										$ 21,000,000
Number of payments of principal and interest payable monthly										36
Minimum aggregate net cash proceeds required to be received to make interest only payments										65,000,000
Number of interest and principal payments to be made if minimum required aggregate net cash proceeds are received										30
Future principal payments under the New Credit Facility
2015			3,500,000
2016			7,000,000
2017			7,000,000
2018			3,500,000
Total			21,000,000
Additional term loan that can be requested if threshold of IPO is met											9,000,000
Threshold net cash proceed as prerequisite to request additional term loan											65,000,000
Basis spread (as a percent)										9.85%
Variable interest rate, description										one-month LIBOR
Proceeds used to repay existing credit facility		9,300,000
Number of shares that can be purchased for warrants issued					10,258				718,201
Exercise price of warrant (in dollars per share)					$ 61.42		$ 14.004
Share issue price (in dollars per share)	$ 8.00				$ 8.00
Conversion of convertible preferred stock, and associated accumulated dividends into common stock (in shares)	19,465,132					(448,060)
Conversion of convertible preferred stock, and associated accumulated dividends into common stock (in shares)								78,760
Expiration term of warrants					5 years
Fair value of warrants issued				1,945,000						300,000
Payment of facility fees to lender										300,000
Payment of reimbursed costs to lender										$ 100,000
Debt discount amortization period										48 months