Debt (Details) (Note Agreement 1, USD $)	0 Months Ended	3 Months Ended
	Jul. 11, 2014 tranche Lender	Mar. 31, 2015	Jul. 11, 2014
Debt Instrument [Line Items]
Number of lenders	2
Maximum borrowings available	$ 30,000,000		$ 30,000,000
Number of tranches	2
Interest rate including both the variable rate and the basis spread (as a percent)		7.22%
Final fee as a percentage of original principal amount of amounts borrowed	4.75%		4.75%
Minimum amount of denomination for prepayment of borrowings	1,000,000		1,000,000
Effective interest rate including final fee interest and non-cash interest (as a percent)		9.30%
Prior to first anniversary of borrowing date
Debt Instrument [Line Items]
Prepayment premium (as a percent)	1.50%		1.50%
Prior to second anniversary and after first anniversary of borrowing date
Debt Instrument [Line Items]
Prepayment premium (as a percent)	1.00%		1.00%
Prior To Maturity Date And After Second Anniversary Of Borrowing Date [Member]
Debt Instrument [Line Items]
Prepayment premium (as a percent)	0.50%		0.50%
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Variable Interest Rate	one-month LIBOR
Basis spread (as a percent)	7.05%
Tranche A
Debt Instrument [Line Items]
Maximum borrowings available	20,000,000		20,000,000
Minimum amount of draw upon closing	10,000,000		10,000,000
Minimum amount of draw after closing	5,000,000		5,000,000
Proceeds received on borrowing, net of deferred financing costs		19,700,000
Tranche B
Debt Instrument [Line Items]
Maximum borrowings available	10,000,000		10,000,000
Minimum net proceeds to be received from stock offering, equity raise, or strategic partner arrangement to allow for borrowing	30,000,000		30,000,000
Remaining borrowing capacity		10,000,000