Common Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended
	Jul. 31, 2006	Mar. 31, 2016	Dec. 31, 2015
Schedule of Capitalization, Equity [Line Items]
Common stock, par value (in dollars per share)		$ 0.001	$ 0.001
Common stock, shares authorized (in shares)		125,000,000	125,000,000
Common stock, shares issued (in shares)		13,906,828	13,905,599
Common stock, shares outstanding (in shares)		13,906,828	13,905,599
Number of warrants issued to purchase common stock		14,033	14,033
Series C-1 Convertible Preferred Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Number of warrants issued to purchase common stock	196,923
Exercise price of warrants	$ 3.25
Fair value of warrants	$ 459
Common Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Number of warrants issued to purchase common stock	14,033
Exercise price of warrants	$ 45.61