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Stock-Based Compensation - Additional Information (Detail) (USD $) | 12 Months Ended |  |  | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Employee Stock Purchase Plan [Member] | Dec. 31, 2013 Restricted stock [Member] | Dec. 31, 2012 Restricted stock [Member] | Dec. 31, 2011 Restricted stock [Member] | Dec. 31, 2013 Restricted stock [Member] Board of Directors non-employee [Member] | Dec. 31, 2013 Restricted stock [Member] Key officers and employees [Member] | Dec. 31, 2013 Stock options [Member] | Dec. 31, 2013 1995 Stock Option Plan [Member] | Dec. 31, 2013 2005 Stock Option [Member] | Dec. 31, 2013 2005 Stock Option [Member] Maximum [Member] | Oct. 11, 2007 2005 Stock Option [Member] Minimum [Member] | Jul. 28, 2005 2005 Stock Option [Member] Minimum [Member] | Dec. 31, 2013 2005 Stock Option [Member] Restricted stock [Member] Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
1995 Stock option expiry date |  |  |  |  |  |  |  |  |  |  | May 24, 2005 |  |  |  |  |
Restricted stock vesting period |  |  |  |  |  |  |  | 12 months | 48 months |  |  | 4 years | 48 months |  |  | 12 months
Stock option expiration period |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |
Maximum number of shares available for issuance under plan |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  | 7,000,000 | 5,000,000 |
Additional shares authorized, percent |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |
Number of additional shares authorized |  |  |  |  |  |  |  |  |  |  |  | 750,000 |  |  |  |
Percentage of market value |  |  |  | 85.00% |  |  |  |  |  |  |  |  |  |  |  |
Percentage of employee's payroll deductions limited to employee's compensation |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |
Maximum Stock value of shares purchased by employees if one thousand shares purchased |  |  |  | $ 25,000 |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of shares that employee can purchase each period |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock shares granted |  |  |  |  |  |  |  | 40,000 | 1,500,000 |  |  |  |  |  |  |
Value of restricted stock granted |  |  |  |  |  |  |  | 100,000 | 2,500,000 |  |  |  |  |  |  |
Stock-based compensation | 3,533,000 | 3,949,000 | 6,530,000 |  | 400,000 | 400,000 | 1,500,000 |  |  |  |  |  |  |  |  |
Exercise of common stock options, shares |  | 32,000 | 7,000 |  |  |  |  |  |  | 0 |  |  |  |  |  |
Weighted average grant-date fair value of stock options granted | $ 0.63 | $ 0.80 | $ 1.16 |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation costs related to non-vested awards granted |  |  |  |  |  |  |  |  |  | $ 4,300,000 |  |  |  |  |  |
Number of shares available for future grants |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |

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- Definition Maximum stock value of shares purchased by employees. + References No definition available. + Details
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- Definition Percentage of employee compensation for employee payroll deduction. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Date the equity-based award expires, in CCYY-MM-DD format. + 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of non-option equity instruments granted to participants. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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=6415400&loc=d3e5070-113901 + Details
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