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Debt - Additional Information (Details)		1 Months Ended	2 Months Ended	3 Months Ended	9 Months Ended
	May. 30, 2014 shares	Dec. 31, 2013 USD ($)	Feb. 28, 2014 USD ($)	Sep. 30, 2015 USD ($) Installment $ / shares	Sep. 30, 2015 USD ($) Installment $ / shares	Sep. 30, 2014 USD ($)	Jan. 31, 2014 USD ($)
Debt Instrument [Line Items]
Amortization of debt issue costs				$ 6,000	$ 17,000	$ 23,000
Comerica Loan [Member]
Debt Instrument [Line Items]
Warrant purchase price | $ / shares				$ 8.5344	$ 8.5344
Warrant expiration date					Dec. 29, 2015
Costs incurred in execution of loan					$ 22,000
Advances				$ 0	0
Comerica Loan [Member] | Loan and Security Agreement [Member]
Debt Instrument [Line Items]
Borrowing capacity				$ 10,000,000	$ 10,000,000
Line of credit facility, term					12 months
Number of installments | Installment				36	36
Loan due date					Dec. 31, 2018
Series A Convertible Preferred Stock | Comerica Loan [Member] | Loan and Security Agreement [Member]
Debt Instrument [Line Items]
Warrants issued to purchase preferred stock				1.50%	1.50%
2013 Convertible Notes Payable [Member]
Debt Instrument [Line Items]
Convertible notes issued		$ 1,250,000
Interest rate		8.00%
Conversion discount rate		15.00%
Proceeds from sale of equity securities		$ 13,750,000
Notes maturity date					Feb. 08, 2014
Notes extended maturity date					Jul. 30, 2014
2014 Convertible Notes Payable [Member]
Debt Instrument [Line Items]
Convertible notes issued			$ 450,000				$ 500,000
Interest rate			8.00%
Conversion discount rate			15.00%
Notes maturity date					Jul. 30, 2014
2014 Convertible Notes Payable [Member] | Series A Convertible Preferred Stock
Debt Instrument [Line Items]
Debt Conversion, Converted Instrument, Shares Issued | shares	321,492

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Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.

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Contractual interest rate for funds borrowed, under the debt agreement.

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