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STOCK-BASED COMPENSATION, Equity Instruments Other Than Options (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Restricted stock awards and units vesting terms |  |  | 2 years |
Fair value of shares withheld for tax withholding obligations |  |  | $ 2,600,000 | $ 3,000,000
Restricted Stock and Units [Member] |  |  |  |
Equity instruments other than options [Roll Forward] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  | 59,027 |
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Restricted stock awards and units vesting terms |  |  | 3 years |
Shares withheld for tax withholding obligations (in shares) |  |  | 75,314 | 94,087
Total fair value of performance unit awards granted |  |  | 2,000,000 |
Restricted Stock and Units [Member] | Minimum [Member] |  |  |  |
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Restricted stock awards and units vesting terms |  |  | 1 year |
Restricted Stock and Units [Member] | Maximum [Member] |  |  |  |
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Restricted stock awards and units vesting terms |  |  | 6 years |
Restricted Stock and Units [Member] | Selling, General and Adminstrative Expense [Member] |  |  |  |
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Compensation expense | 914,000 | 1,100,000 | 1,800,000 | 1,900,000
Restricted Stock and Units [Member] | Research and Development Expense [Member] |  |  |  |
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Compensation expense | 409,000 | 417,000 | 783,000 | 744,000
Performance Shares [Member] |  |  |  |
Equity instruments other than options [Roll Forward] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  | 36,092 |
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Total fair value of performance unit awards granted |  |  | 1,400,000 |
Performance Shares [Member] | Selling, General and Adminstrative Expense [Member] |  |  |  |
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Compensation expense | 198,000 | 137,000 | 685,000 | 175,000
Performance Shares [Member] | Research and Development Expense [Member] |  |  |  |
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Compensation expense | 60,000 | 42,000 | 207,000 | 53,000
Non Employee Members of Scientific Advisory Board [Member] | Restricted Stock and Units [Member] | Research and Development Expense [Member] |  |  |  |
Stock-based compensation, aggregate disclosures [Abstract] |  |  |  |
Compensation expense | $ 57,000 | $ 44,000 | $ 100,000 | $ 130,000
Performance-Based Vesting Requirement [Member] | Performance Shares [Member] |  |  |  |
Equity instruments other than options [Roll Forward] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  | 18,044 |
Market-Based Vesting Requirement [Member] | Performance Shares [Member] |  |  |  |
Equity instruments other than options [Roll Forward] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  | 18,048 |

X
- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Total Grant Date Fair Value + References No definition available. + Details
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Namespace Prefix: | panl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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 For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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