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Quarterly Results (unaudited) - Quarterly Results Financial Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                    
Revenues $ 10,827 $ 13,815 $ 10,520 $ 10,268 $ 8,793 $ 13,103 $ 9,978 $ 9,706 $ 45,430 $ 41,580
Operating loss (2,366) (1,193) (563) (684) (3,297) (854) (1,442) (1,271) (4,806) (6,864)
Loss before income tax expense (2,369) (1,172) (535) (664) (3,259) (756) (1,429) (1,263) (4,740) (6,707)
Net (loss) income (2,378) (1,201) (535) (664) (3,257) (756) (1,461) (1,288) (4,778) (6,762)
Net income (loss) attributable to common stockholders $ (3,225) $ (1,510) $ 387 $ 286 $ (4,576) $ (1,046) $ (1,995) $ (1,724) $ (5,025) $ (8,993)
Basic income (loss) per share $ (0.98) $ (0.45) $ 0.12 $ 0.09 $ (1.38) $ (0.34) $ (0.60) $ (0.55) $ (1.21) $ (2.81)
Diluted income (loss) per share $ (0.98) $ (0.45) $ 0.11 $ 0.08 $ (1.38) $ (0.34) $ (0.60) $ (0.55) $ (1.21) $ (2.81)