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Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jan. 31, 2013 | Feb. 29, 2012 | Mar. 31, 2013 | Mar. 31, 2012
Stockholders Equity Note [Line Items] |  |  |  |
Shares issued, exercise of stock options |  |  | 260,000 | 554,259
Gross proceeds from exercise of stock options |  |  | $ 0.4 | $ 0.8
Net proceeds from exercise of stock options |  |  | 0.4 | 0.8
Shares issued, exercise of warrants |  |  | 70,000 | 40,000
Gross proceeds from exercise of warrants |  |  | 0.1 | 0.1
Net proceeds from exercise of warrants |  |  | 0.1 | 0.1
Restricted Stock Units (RSUs) |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |
Restricted stock units granted | 434,875 | 584,400 |  |
Restricted stock units, expiration date | Aug. 03, 2015 | Feb. 01, 2015 |  |
Restricted stock units, Expenses |  |  | $ 0.1 | $ 0.4

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- Definition The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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