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Summary of Significant Accounting Policies - Narrative (Detail)
$ / shares in Units, shares in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
Sep. 30, 2020
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
$ / shares
Mar. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Sep. 30, 2019
USD ($)
$ / shares
Jun. 30, 2019
USD ($)
$ / shares
Mar. 31, 2019
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
segment
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Disaggregation of Revenue [Line Items]                      
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest                 $ 24,974,000 $ 39,432,000 $ 25,610,000
Cost of goods sold $ (32,999,000) $ (18,227,000) $ (11,906,000) $ (41,089,000) $ (29,793,000) $ (38,555,000) $ (43,068,000) $ (40,605,000) (104,221,000) (152,021,000) (143,103,000)
Income tax (benefit) expense                 (12,980,000) 7,809,000 5,509,000
Retained earnings 121,267,000       83,313,000       121,267,000 83,313,000  
Net income $ (2,884,000) $ 36,282,000 $ 4,640,000 $ (84,000) $ 2,388,000 $ 10,926,000 $ 14,276,000 $ 4,033,000 $ 37,954,000 $ 31,623,000 $ 20,101,000
Basic (in dollars per share) | $ / shares $ (0.07) $ 0.91 $ 0.12 $ 0 $ 0.06 $ 0.27 $ 0.36 $ 0.10 $ 0.94 $ 0.79 $ 0.50
Diluted (in dollars per share) | $ / shares $ (0.07) $ 0.91 $ 0.12 $ 0 $ 0.05 $ 0.27 $ 0.36 $ 0.10 $ 0.94 $ 0.78 $ 0.50
Deferred revenue, revenue recognized                 $ 3,325,000 $ 1,017,000  
Deferred revenue balance $ 6,875,000       $ 7,654,000       6,875,000 7,654,000  
Unbilled receivables 1,443,000       2,282,000       1,443,000 2,282,000  
Accounts receivable, net 69,720,000       58,925,000       69,720,000 58,925,000  
Amortization of deferred financing charges and debt discount                 290,000 861,000 $ 546,000
Recognized income tax interest and penalties                 0 0 $ 0
Probable environmental matters 0       0       $ 0 $ 0  
Number of operating segments | segment                 1    
Antidilutive securities excluded from computation of earnings per share (in shares) | shares                 1,886 764 854
Right of use assets upon adoption 373,000       505,000       $ 373,000 $ 505,000  
Long-term debt, current and long-term portions 474,000       590,000       474,000 590,000  
Gain (Loss) on sale of assets and asset impairment charges                   15,542,000  
Impairment loss                 5,115,000 15,542,000 $ 17,835,000
Operating lease right-of-use assets 32,099,000       28,178,000       32,099,000 28,178,000  
Operating lease liabilities, current and long-term portions $ 34,097,000       28,577,000       34,097,000 28,577,000  
Additions and revisions of prior estimates                 $ 8,458,000 (5,114,000)  
Revision of Prior Period, Adjustment                      
Disaggregation of Revenue [Line Items]                      
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest                     1,800,000
Cost of goods sold                     1,800,000
Income tax (benefit) expense                     387,000
Retained earnings         1,413,000         1,413,000  
Net income                     $ 1,413,000
Basic (in dollars per share) | $ / shares                     $ 0.03
Diluted (in dollars per share) | $ / shares                     $ 0.03
Accounting Standards Update 2016-02                      
Disaggregation of Revenue [Line Items]                      
Right of use assets upon adoption         $ 35,939,000         35,939,000  
Developed technology                      
Disaggregation of Revenue [Line Items]                      
Useful Life (in years)                 13 years    
Impairment loss                   7,628,000  
Hixton [Member]                      
Disaggregation of Revenue [Line Items]                      
Gain (Loss) on sale of assets and asset impairment charges                 $ 7,914,000    
Shipping                      
Disaggregation of Revenue [Line Items]                      
Cost of goods sold                 $ (40,891,000) $ (76,643,000) $ (70,532,000)