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Stock-Based Compensation Plans (Narrative) (Details) (USD $) | 3 Months Ended | 6 Months Ended |  | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2013 | Jun. 30, 2013 Employee Stock Option Plan [Member] | Jun. 30, 2013 Employee Stock Option Plan [Member] Minimum [Member] | Jun. 30, 2013 Employee Stock Option Plan [Member] Maximum [Member] | Jun. 30, 2013 Non-Employee Director Stock Option Plan [Member] | May 31, 2013 Employee Stock Purchase Plan [Member] | Jun. 30, 2013 Restricted Stock Plan [Member] | Jun. 30, 2013 Restricted Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Compensation expense for share-based payments | $ 3,544,677 | $ 6,733,888 |  |  |  |  |  |  |
Compensation cost capitalized as part of inventory |  | 193,600 |  |  |  |  |  |  |
Option vesting period |  |  |  | 1 year | 5 years | 6 months |  |  |
Option expiration period |  |  |  | 2 years | 7 years | 10 years |  |  |
Unrecognized compensation cost |  |  | 21,406,740 |  |  | 285,566 |  |  |
Options granted (in shares) |  |  |  |  |  | 84,000 |  |  |
Shares approved (in shares) |  |  |  |  |  |  | 1,000,000 |  |
ESPP discount rate |  |  |  |  |  |  | 85.00% |  |
ESPP discount rate recognized as compensation expense |  |  |  |  |  |  | 15.00% |  |
Options granted (in shares) |  |  |  |  |  |  |  | 2,000,000 | 2,000,000
Restricted period, maximum, in years |  |  |  |  |  |  |  |  | 10 years
Unearned stock-based compensation |  |  |  |  |  |  |  | 9,177,978 | 9,177,978
Amortization expense |  |  |  |  |  |  |  | $ 683,215 | $ 1,344,067

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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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b -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 3: 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=6793087&loc=d3e301413-122809 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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