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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

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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition Interest paid other than in cash for example by issuing additional debt securities. As a noncash item, it is added to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition The cash outflow for acquisition of or capital improvements to properties held for investment (operating, managed, leased) or for use. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition The cash outflow for loan and debt issuance costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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