Annual report pursuant to Section 13 and 15(d)

Quarterly Information (Unaudited) (Detail)

v3.8.0.1
Quarterly Information (Unaudited) (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
Dec. 31, 2015
Quarterly Financial Information [Line Items]                      
Revenues $ 35,200 $ 43,100 $ 43,400 $ 30,600 $ 51,200 $ 50,200 $ 43,100 $ 27,600 $ 152,312 $ 172,121 $ 129,656
Gross profit 3,500 13,900 14,200 10,100 17,600 15,900 13,300 9,100 41,662 55,871 43,290
Net income (loss) $ (45,700) $ (2,500) $ (700) $ (5,000) $ 1,600 $ 1,600 $ (1,100) $ (2,600) $ (53,907) $ (522) $ (2,382)
Basic and diluted net income (loss) per common share $ (2.17) $ (0.12) $ (0.03) $ (0.24) $ 0.08 $ 0.08 $ (0.06) $ (0.16) $ (2.59) $ (0.03) $ (0.16)