Debt (Details)			12 Months Ended
	Apr. 06, 2015 USD ($)	Aug. 28, 2014 USD ($) Loan	Dec. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)	Jan. 29, 2015 USD ($)
Future Principal Payments [Abstract]
2016			$ 2,271,000
2017			2,513,000
2018			682,000
Total			$ 5,466,000
Convertible Preferred Stock - Series C-2 [Member]
Loan and Security Agreement [Abstract]
Investment made by lender in unregistered financing	$ 1,000,000
Loan and Security Agreement [Member]
Loan and Security Agreement [Abstract]
Aggregate principal amount of borrowing capacity		$ 10,000,000
Number of term loans | Loan		3
Interest rate	9.95%	10.45%
Adjustment to interest rate	(4.50%)	(4.50%)
Amortization period for equal monthly installments of principal and interest		30 months
Additional interest rate charged on due date		1.50%
Prepayment charge during second year following initial closing		2.00%
Prepayment charge after second year following initial closing		1.00%
Principal amount of term loan advance that can be converted in unregistered financing		$ 1,000,000
Additional investment that can be made in same subsequent unregistered financing		1,000,000
Loan and Security Agreement [Member] | Minimum [Member]
Loan and Security Agreement [Abstract]
Cash proceeds received for second milestone event	$ 55,000,000
Initial Term Loan Advance [Member]
Loan and Security Agreement [Abstract]
Funded amount		$ 3,000,000
Maturity date			Mar. 01, 2018
Term Loan Advance - First Draw Period [Member]
Loan and Security Agreement [Abstract]
Funded amount					$ 3,000,000
Maturity date			Mar. 01, 2018
Term Loan Advance - Second Draw Period [Member]
Loan and Security Agreement [Abstract]
Maturity date			Jun. 30, 2015
Unused borrowing capacity				$ 4,000,000