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Quarterly Results of Operations (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Quarterly results of operations:                              
Net sales $ 73,168 $ 81,025 $ 80,461 $ 72,829 $ 60,654 $ 59,873 $ 37,806 $ 64,023 $ 56,122 $ 74,655 $ 81,247 $ 72,266 $ 307,483 $ 222,356 $ 284,290
Gross margin 8,475 6,415 13,736 12,718 9,967 10,838 2,903 10,766 3,382 6,484 8,491 3,149 41,344 34,474 21,506
Operating income (loss) 1,942 (2,393) 6,173 5,346 3,014 4,321 (1,206) 4,261 (4,121) (4,657) 1,267 (4,017) 11,068 10,390 (11,528)
Net income (loss) $ 441 $ (3,312) $ 4,086 $ 3,456 $ (867) $ 3,343 $ (2,272) $ 7,961 $ (5,462) $ (6,125) $ 209 $ (3,845) $ 4,671 $ 8,165 $ (15,223)
Net income (loss) per common share:                              
Basic (in USD per share) $ 0.05 $ (0.41) $ 0.48 $ 0.41 $ (0.10) $ 0.39 $ (0.29) $ 0.97 $ (0.69) $ (0.78) $ 0.03 $ (0.49) $ 0.55 $ 0.98 $ (1.94)
Diluted (in USD per share) $ 0.05 $ (0.41) $ 0.48 $ 0.41 $ (0.10) $ 0.39 $ (0.29) $ 0.97 $ (0.69) $ (0.78) $ 0.03 $ (0.49) $ 0.55 $ 0.98 $ (1.94)
Product sales                              
Quarterly results of operations:                              
Net sales $ 68,132 $ 67,643 $ 79,117 $ 69,133 $ 58,563 $ 54,240 $ 35,847 $ 61,930 $ 54,585 $ 67,511 $ 75,440 $ 71,451 $ 284,025 $ 210,580 $ 268,987
Tooling sales                              
Quarterly results of operations:                              
Net sales $ 5,036 $ 13,382 $ 1,344 $ 3,696 $ 2,091 $ 5,633 $ 1,959 $ 2,093 $ 1,537 $ 7,144 $ 5,807 $ 815 $ 23,458 $ 11,776 $ 15,303