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Quarterly Financial Data (Unaudited) - Summary of Quarterly Financial Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 29,451 $ 10,927 $ 8,494 $ 10,359 $ 15,165 $ 9,025 $ 10,437 $ 13,071 $ 59,231 $ 47,698 $ 68,170
Cost of goods sold 8,770 5,931 6,531 5,337 3,867 4,865 4,467 7,804 26,569 21,003 29,934
Operating expenses 5,408 2,461 2,214 2,188 2,254 2,314 2,805 2,739 12,271 10,112 12,470
Net income (loss) $ 12,441 $ (95) $ (2,349) $ 382 $ 2,265 $ 1,796 $ 726 $ 203 $ 10,379 $ 4,990 $ 7,556
Earnings per share, basic $ 0.40   $ (0.11) $ 0.02 $ 0.10 $ 0.08 $ 0.03 $ 0.01 $ 0.43 $ 0.23 $ 0.34
Earnings per share, diluted $ 0.40   $ (0.11) $ 0.01 $ 0.09 $ 0.07 $ 0.03 $ 0.01 $ 0.42 $ 0.19 $ 0.29
Weighted average common shares outstanding 30,952,000 22,189,000 22,169,000 22,135,000 22,114,000 22,112,000 22,092,000 22,039,000 24,322,264 22,114,400 22,039,966
Diluted 31,210,000 22,189,000 22,169,000 26,410,000 26,400,000 26,388,000 26,410,000 26,411,000 24,579,390 26,400,000 26,242,952