Fair Value of Financial Instruments - Summary of Changes in Fair Value of Level1 and Level 3 Financial Instruments (Detail) - USD ($) $ in Thousands		3 Months Ended
	Feb. 12, 2016	Mar. 31, 2016	Mar. 05, 2015
Series A Warrant [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
De-recognition of Warrant liability upon exercise, in shares		(24,000)
Balance at the end of period, in shares		2,425,605
Series A Warrant [Member] | Common stock warrant liability [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at the beginning of period, in shares		2,425,605
Balance at the end of period, in shares		2,425,605
Balance at the beginning of period		$ 1,213
Change in value of Warrant		(655)
Balance at end of period		$ 558
Series B Warrant [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
De-recognition of Warrant liability upon exercise, in shares			(589,510)
Series B Warrant [Member] | Common stock warrant liability [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at the beginning of period, in shares		116,580
De-recognition of Series B Warrant liability upon expiration, in shares		(14,280)
Balance at the end of period, in shares		0
Balance at the beginning of period		$ 865
Change in value of Warrant		(272)
Balance at end of period		$ 0
Series B Warrant [Member] | Common stock warrant liability [Member] | Cash Less Exercise [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
De-recognition of Warrant liability upon exercise, in shares	(102,300)	(102,300)
De-recognition of Warrant liability upon exercise	$ (594)	$ (593)
De-recognition of Warrant liability upon exercise, shares issued	485,202	485,202
Series C Warrant [Member] | Common stock warrant liability [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at the beginning of period, in shares		590,415
Balance at the end of period, in shares		590,415
Balance at the beginning of period		$ 462
Change in value of Warrant		(243)
Balance at end of period		$ 219