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Employee Benefit Plans - Status of Stock Options Related to Stock Plans (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Options Outstanding Beginning Balance | 439,000 |  |
Options Outstanding Exercised | (25,000) |  |
Options Outstanding Forfeited | (186,000) |  |
Options Outstanding Ending Balance | 228,000 | 439,000 |
Options Outstanding Exercisable | 228,000 |  |
Weighted Average Exercise Price Per Share, Beginning Balance | $ 13.42 |  |
Weighted Average Exercise Price Per Share, Exercised | 1.81 |  |
Weighted Average Exercise Price Per Share, Forfeited | 29.14 |  |
Weighted Average Exercise Price Per Share, Ending Balance | 1.81 | $ 13.42 |
Weighted Average Exercise Price Per Share, Exercisable | $ 1.81 |  |
Weighted Average Remaining Contractual Term | 1 year 3 months 18 days | 1 year 4 months 24 days |
Weighted Average Remaining Contractual Term, Exercisable | 1 year 3 months 18 days |  |
Aggregate Intrinsic Value, Beginning Balance | $ 3,787 | $ 5,327 |
Aggregate Intrinsic Value, Exercisable | 3,787 |  |
Intrinsic value of stock options exercised | $ 425 | $ 250 | $ 2,511
Minimum [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Exercise Price Per Share, Beginning Balance | $ 1.81 |  |
Exercise Price Per Share, Exercised | 1.81 |  |
Exercise Price Per Share, Forfeited | 28.04 |  |
Exercise Price Per Share, Ending Balance | 1.81 | $ 1.81 |
Exercise Price Per Share, Exercisable | 1.81 |  |
Maximum [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Exercise Price Per Share, Beginning Balance | 30.07 |  |
Exercise Price Per Share, Exercised | 1.81 |  |
Exercise Price Per Share, Forfeited | 30.07 |  |
Exercise Price Per Share, Ending Balance | 1.81 | $ 30.07 |
Exercise Price Per Share, Exercisable | $ 1.81 |  |

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- Definition Share based compensation shares authorized under stock option plans forfeited exercise price range lower range limit. + References No definition available. + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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