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Selected Quarterly Financial Data (Unaudited) - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 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
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash provided by (used in) operating activities                                
Net (loss) income $ (6,130) $ (9,202) $ (7,747) $ (24,533) $ (6,640) $ (8,717) $ (28,792) $ (3,323) $ (32,280) $ (32,115) $ (41,482) $ (40,832) $ (47,612) $ (47,472) $ (2,891) $ 21,477
Adjustments to reconcile net (loss) income to net cash provided by operating activities:                                
Amortization of intangible assets       1,209       1,429 2,419 2,857 3,628 4,286 4,838 5,716 5,287 2,108
Depreciation       1,172       1,118 2,342 2,250 3,502 3,412 4,634 4,582 4,030 2,520
Change in valuation of warrants       0       (1,256) 800 (1,413) 2,500 (1,413) 4,000 (1,413) (9,300) (6,170)
Stock compensation expense       (865)       441 (1,028) 692 (297) 1,188 473 1,619 1,501 1,487
Amortization of financing fees       3,109       143 3,441 445 3,778 1,451 4,117 3,048 443 87
Deferred income taxes       469       (1,628) 602 18,029 746 18,179 239 18,121 (9,058) (1,624)
Loss on debt extinguishment and modifications       11,921       0 11,921 0 11,921 25 11,921 357 12 0
Asset impairment charges               345   1,410   1,447 1 1,614 11,686 310
Change in valuation of contingent consideration               0   (283)   (283) 0 (283) (23) (3,840)
Provision for doubtful accounts       48       (10) 131 24 216 69 67 80 288 70
Provision for inventory obsolescence       146       288 539 3,441 882 3,928 421 5,341 1,712 1,856
Loss (gain) on disposal of fixed assets       10       236 66 (852) 115 (846) 423 (663) 175 321
Other sources, net       135       113 198 205 189 266 13 413 681 612
Changes in operating assets and liabilities:                                
Trade accounts receivable, net       (4,017)       25,158 3,532 12,624 (691) 17,100 (8,391) 10,116 10,589 (30,682)
Inventory, net       3,122       22,288 (3,326) 42,947 (13,408) 46,390 13,366 55,564 (47,505) (44,240)
Prepaid expenses and other assets       (1,624)       (207) 1,238 (1,261) (1,359) (2,443) (2,284) (12,893) 2,126 (3,224)
Trade accounts payable       15,186       (36,459) 3,244 (30,324) 1,879 (34,056) (1,198) (27,037) 5,913 37,647
Income taxes refundable (payable)       298       3,441 5,135 1,783 6,293 (682) 6,508 (1,783) (7,673) 1,327
Accrued expenses       2,432       1,891 3,242 3,041 8,867 6,099 6,029 15,709 1,085 5,096
Other noncurrent liabilities       121       98 894 (1,011) 821 (1,028) (5,260) 1,601 8,107 (232)
Net cash (used in) provided by operating activities       8,097       13,910 1,322 24,511 (13,542) 24,313 (7,695) 32,282 (22,815) (15,094)
Cash flows from investing activities:                                
Capital expenditures       (1,896)       (1,099) (2,669) (1,977) (3,856) (3,286) (5,061) (3,872) (8,409) (8,214)
Proceeds from disposal of assets               0   2,466   2,466 0 2,466 0 0
Other sources, net       0       0 245 0 245 245 (104) (245) (1,169) 14
Net cash used in investing activities       (1,896)       (1,099) (2,424) 489 (3,611) (1,065) (5,165) (1,651) (43,805) (52,322)
Cash flows from financing activities                                
Proceeds from issuance of long-term debt       (71,400)       0 (71,400) 60,000 (71,400) 60,000        
Financing fees       (253)       0 (928) (3,402) (928) (3,402) (928) (5,802) (1,517) (154)
Net proceeds from stock offering and warrants       59,396       0 59,396 2,001 59,396 2,001 59,396 2,001 65 1,425
Proceeds from revolving line of credit       85,945       46,902 209,082 111,902 324,416 196,179 436,228 281,007 93,629 82,401
Repayments of revolving line of credit       (81,833)       (63,634) (196,593) (195,164) (295,859) (276,484) (411,948) (365,532) (74,359) (22,305)
Acquisition of businesses contingent consideration payments       (6)       (3,029) (9) (8,258) (19) (8,279) (26) (8,348) 0 0
Other uses, net       0       0 (738) (89) (745) (98) (754) (110) (351) (430)
Net cash provided by (used in) financing activities       (8,151)       (19,761) (1,190) (33,010) 14,861 (30,083) 10,568 (36,784) 68,504 67,671
Decrease in cash       (1,950)       (6,950) (2,292) (8,010) (2,292) (6,835) (2,292) (6,153) 1,884 255
Cash at beginning of the year $ 0 0 342 2,292 1,610 435 1,495 8,445 2,292 8,445 2,292 8,445 $ 2,292 8,445 6,561 6,306
Cash at end of the year   $ 0 $ 0 $ 342 $ 2,292 $ 1,610 $ 435 $ 1,495 $ 0 $ 435 $ 0 $ 1,610   $ 2,292 $ 8,445 $ 6,561