Quarterly report pursuant to Section 13 or 15(d)

Loss per Share of Common Stock - Basic and Diluted Loss Per Share of Common Stock (Detail)

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Loss per Share of Common Stock - Basic and Diluted Loss Per Share of Common Stock (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Calculation of basic loss per share of common stock:        
Net loss attributable to common stockholders $ (2,329) $ (1,382) $ (3,385) $ (2,788)
Denominator for basic weighted average shares of common stock (in shares) 23,509,054 21,403,808 22,915,086 20,820,559
Basic loss per share of common stock (in dollars per share) $ (0.10) $ (0.06) $ (0.15) $ (0.13)
Calculation of diluted loss per share of common stock:        
Net loss attributable to common stockholders $ (2,329) $ (1,382) $ (3,385) $ (2,788)
Net loss attributable to common stockholders plus assumed conversions $ (2,329) $ (1,382) $ (3,385) $ (2,788)
Denominator for basic weighted average shares of common stock (in shares) 23,509,054 21,403,808 22,915,086 20,820,559
Effect of convertible senior common stock (in shares) 0 0 0 0
Denominator for diluted weighted average shares of common stock (in shares) 23,509,054 21,403,808 22,915,086 20,820,559
Diluted loss per share of common stock (in dollars per share) $ (0.10) $ (0.06) $ (0.15) $ (0.13)