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Stock-Based Compensation - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 6 Months Ended | 9 Months Ended |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Minimum [Member] | Sep. 30, 2014 Maximum [Member] | Sep. 30, 2014 Common stock [Member] | Sep. 30, 2014 Stock options [Member] | Sep. 30, 2014 Restricted stock [Member] | Sep. 30, 2013 Restricted stock [Member] | Sep. 30, 2014 Employee Stock Purchase Plan [Member] | Sep. 30, 2014 2005 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock options granted |  |  |  |  |  |  |  | 45,000 |  |  |  |
Restricted stock, granted |  |  |  |  |  |  |  |  | 1,600,000 |  |  |
Value of restricted stock granted |  |  |  |  |  |  |  |  | $ 2,900,000 |  |  |
Restricted stock vesting period |  |  |  |  | 12 months | 48 months |  |  |  |  |  |
Number of shares available for future grants |  |  |  |  |  |  |  |  |  |  |  | 2,000,000
Employee stock purchase plan (ESPP), shares |  |  |  |  |  |  | 14,000 |  |  |  |  |
Employee stock purchase plan, grant date fair value |  |  |  |  |  |  |  |  |  |  | $ 0.83 |
Stock-based compensation | $ 532,000 | $ 821,000 | $ 3,095,000 | $ 2,747,000 |  |  |  |  | $ 100,000 | $ 300,000 |  |

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- Definition The total fair value at grant date of restricted shares issued during the period from an approved Stock Option/Stock Issuance Plan. + References No definition available. + Details
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- Definition The fair value at grant date for shares issued during the period from an employee stock purchase plan. + References No definition available. + Details
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- Definition Shares issued from an employee stock purchase plan during the six month purchase period. + References No definition available. + 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 The number of grants made 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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- 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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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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