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Stockholders' Equity - Summary of Restricted Stock Activity (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Income tax benefit | $ (54,000) | $ (164,000) | $ (444,000)
Restricted Stock [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Unvested restricted stock outstanding at beginning of year | 1,189,473 |  |
Granted, Shares | 369,350 | 469,465 | 850,771
Vested, Shares | (806,927) |  |
Cancelled or forfeited, Shares | (12,431) |  |
Unvested restricted stock outstanding at end of year | 739,465 | 1,189,473 |
Unvested restricted stock outstanding at beginning period, weighted-average grand date fair value | $ 7.51 |  |
Weighted-average fair value per restricted stock granted during year | 5.47 | $ 9.11 | $ 7.82
Vested, weighted-average grant date fair value | 9.11 |  |
Cancelled or forfeited, weighted-average grant date fair value | 6.20 |  |
Unvested restricted stock outstanding at end of year, Weighted-average granted date fair value | $ 7.79 | $ 7.51 |
Total fair value of restricted stock granted | $ 2,019,000 | $ 4,277,000 | $ 6,652,000
Income tax benefit | $ (398,000) | $ (1,659,000) | $ (1,157,000)
Total weighted-average remaining vesting period in years | 1 year 9 months 10 days | 1 year 11 months 12 days | 2 years 4 months 28 days
Total fair value of restricted stock vested during the year | $ 7,355,000 | $ 3,124,000 | $ 2,579,000
Restricted Stock [Member] | Cost of Sales [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock-based compensation expense | 385,000 | 312,000 | 240,000
Restricted Stock [Member] | SG&A [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 7,574,000 | $ 3,987,000 | $ 2,773,000
Restricted Stock Units [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Unvested restricted stock outstanding at beginning of year | 43,764 |  |
Granted, Shares | 35,511 | 37,992 | 27,654
Vested, Shares | (10,941) |  |
Unvested restricted stock outstanding at end of year | 68,334 | 43,764 |
Unvested restricted stock outstanding at beginning period, weighted-average grand date fair value | $ 11.42 |  |
Weighted-average fair value per restricted stock granted during year | 5.28 | $ 9.87 | $ 13.56
Vested, weighted-average grant date fair value | 11.42 |  |
Unvested restricted stock outstanding at end of year, Weighted-average granted date fair value | $ 8.23 | $ 11.42 |
Total fair value of restricted stock granted | $ 187,000 | $ 375,000 | $ 375,000
Income tax benefit | $ (34,000) | $ (115,000) | $ (144,000)
Total weighted-average remaining vesting period in years | 1 year 9 months | 3 years 18 days | 2 years 6 months
Total fair value of restricted stock vested during the year | $ 125,000 | $ 250,000 |
Restricted Stock Units [Member] | SG&A [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 187,000 | $ 375,000 | $ 375,000

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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