Notes Payable (Detail) (USD $)	6 Months Ended		3 Months Ended	6 Months Ended		2 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2014 Oxford Midcap Loan [Member]	Jun. 30, 2014 Oxford Midcap Loan [Member]	Mar. 04, 2014 Oxford Midcap Loan [Member]	Mar. 04, 2014 Oxford Loan Agreement [Member]
Debt Instrument [Line Items]
Loan and security agreement, existing outstanding indebtedness					$ 32,000,000
Repayments of Debt			19,100,000
Payments of Debt Restructuring Costs			160,000
Proceeds from Issuance of Long-term Debt	12,699,000	0	12,699,000
Accrued interest rate				9.25%
Debt Instrument, Date of First Required Payment				Apr. 01, 2015
Debt Instrument, Periodic Payment				1,021,000
Debt Instrument, Fee Amount				2,200,000
Debt Prepayment Penalty Rate				1.00%
Additional Default Interest Rate				5.00%
Debt Issuance Cost			244,000			103,000
Unamortized balance of debt discount				2,024,000
Unamortized balance of debt issuance costs				$ 312,000