Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Sep. 02, 2016
Debt Instrument [Line Items]
Warrant liability	$ 1,210,000	$ 2,100,000
Debt discount	1,900,000
Long-term debt, carrying amount	1,934,000
Debt issuance costs	$ 200,000
Unterberg Koller Capital Fund L.P. and William W. and Dieva L. Smith [Member] | Note and Warrant Purchase Agreement [Member]
Debt Instrument [Line Items]
Purchase of warrants		1,700,000
Common stock exercise price		$ 2.74
Warrants expiration period	5 years
Notes and warrants issuance date	Sep. 06, 2016
Unterberg Koller Capital Fund L.P. and William W. and Dieva L. Smith [Member] | Senior Subordinated Notes [Member] | Note and Warrant Purchase Agreement [Member]
Debt Instrument [Line Items]
Aggregate principal amount		$ 4,000,000