Long-Term Debt - Additional Information (Detail) - USD ($)	Aug. 04, 2015	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Carrying value of term loan		$ 15,072,000
Term loan due within 12 months		384,000
Term loan due in greater than 12 months		14,688,000	$ 15,002,000
Debt issuance costs	$ 150,000
Mid Cap Financial Trust [Member] | 2015 Term Loan [Member]
Debt Instrument [Line Items]
Term loan, maximum borrowings	$ 30,000,000
Debt instrument description	The Company must maintain a balance in cash or cash equivalents at Silicon Valley Bank equal to the principal balance of the loan plus 5 percent.
Debt instrument interest rate	6.25%
Term loan, first periodic payment date	Mar. 01, 2017
Term loan, last periodic payment date	Feb. 01, 2020
Interest on final payment	9.00%
Term loan, payment description	Interest-only period of 19 months, principal will be due in 36 equal monthly installments.
Carrying value of term loan		15,072,000
Term loan due within 12 months		384,000
Term loan due in greater than 12 months		$ 14,688,000
Mid Cap Financial Trust [Member] | 2015 Term Loan [Member] | Interest-Only-Strip [Member]
Debt Instrument [Line Items]
Term loan, Interest payment period	19 months
Mid Cap Financial Trust [Member] | 2015 Term Loan [Member] | Principal-Only-Strip [Member]
Debt Instrument [Line Items]
Term loan, Interest payment period	36 months
Mid Cap Financial Trust [Member] | 2015 Term Loan [Member] | Initial Term Loan [Member]
Debt Instrument [Line Items]
Term loan, currently borrowed	$ 15,000,000
Mid Cap Financial Trust [Member] | 2015 Term Loan [Member] | Second Term Loan [Member]
Debt Instrument [Line Items]
Term loan, remaining borrowing	$ 15,000,000