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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]      
Revenues $ 137,212 $ 59,231 $ 47,698
Cost of goods sold 100,304 26,569 21,003
Gross profit 36,908 32,662 26,695
Operating expenses:      
Salaries, benefits and payroll taxes 8,219 7,385 5,055
Depreciation and amortization 525 384 388
Selling, general and administrative 9,459 4,502 4,669
Total operating expenses 18,203 12,271 10,112
Operating income 18,705 20,391 16,583
Other income (expenses):      
Preferred stock interest expense   (5,565) (5,078)
Other interest expense, net (450) (2,862) (2,748)
Other income 462 8,860 362
Total other income (expenses), net 12 433 (7,464)
Loss on extinguishment of debt   (1,051)  
Income before income tax (benefit) expense 18,717 19,773 9,119
Income tax (benefit) expense (2,809) 9,394 4,129
Net income $ 21,526 $ 10,379 $ 4,990
Net income per common share:      
Basic $ 0.54 $ 0.43 $ 0.23
Diluted $ 0.53 $ 0.42 $ 0.19
Weighted-average number of common shares:      
Basic 40,208 24,322 22,114
Diluted 40,304 24,579 26,400