Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		6 Months Ended
	Mar. 25, 2015	Jun. 30, 2015
Stockholders Equity [Line Items]
Gross proceeds from issuance of common stock and warrants	$ 10,000
Net proceeds from issuance of common stock and warrants	$ 9,200
Term of warrants	5 years
Number of shares authorized for grant		4,000,000
Weighted average period for recognizing unrecognized compensation cost as expense		2 years 9 months 18 days
Unrecognized compensation cost related to stock option awards		$ 1,070
Number of options granted		75,000
March 2015 Financing [Member]
Stockholders Equity [Line Items]
Share price of common stock and warrants issued	$ 1.7125
Number of warrants issued for each unit issued	0.5
Common stock issued during period	5,839,420
Warrants exercised	2,919,710
2015 Equity Incentive Plan [Member]
Stockholders Equity [Line Items]
Number of shares authorized for grant		4,000,000
Number of additional shares authorized for grant		725,781
Private Placement [Member]
Stockholders Equity [Line Items]
Exercise Price	$ 2.13
Warrant expiration date	Mar. 20, 2020
Private Placement [Member] | March 2015 Financing [Member]
Stockholders Equity [Line Items]
Warrants exercised	233,577
Minimum [Member]
Stockholders Equity [Line Items]
Option vesting period		3 years
Maximum [Member]
Stockholders Equity [Line Items]
Option vesting period		4 years