Debt and Fair Value of Financial Instruments - Aggregate Fair Value and Carrying Value of Warrant Liability and Long-Term Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Sep. 02, 2016
Fair Value of Warrant Liability and Long Term Debt [Line Items]
Warrant liability, net	$ 1,100		$ 2,100
Carrying Amount [Member]
Fair Value of Warrant Liability and Long Term Debt [Line Items]
Warrant liability, net	1,063	$ 1,210
Long-term debt, net	2,316	1,934
Fair Value [Member]
Fair Value of Warrant Liability and Long Term Debt [Line Items]
Warrant liability, net	1,063	1,210
Long-term debt, net	$ 2,316	$ 1,934