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Stockholders' Equity | 6 Months Ended
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Jun. 30, 2015
Equity [Abstract] |
Stockholders' Equity | Stockholders’ Equity The Company grants options and awards to employees and non-employee directors. Only new shares of common stock are issued upon the exercise of stock options. Non-employee directors are accounted for as employees. Options and restricted stock granted to certain directors vest in equal monthly installments over the one-year period following the date of grant. Options granted to employees vest 1/8 on the six month anniversary of the date of grant, and 1/48 each month thereafter for 42 months. Option awards generally expire ten years from the date of grant. Stock Option Activity The following is a summary of the Company’s stock option plan activity and related information:
| Shares |  | Weighted- Average Exercise Price |  | Weighted-Average Remaining Contractual Term in Years |  | Aggregate Intrinsic Value (In thousands)
Balance as of December 31, 2014 | 1,800,697 |  |  | $ | 28.78 |  |  | 7.3 |  | $ | 51,558 |
Granted | 262,747 |  |  | $ | 58.84 |  |  |  |  |
Exercised | (212,349 | ) |  | $ | 25.58 |  |  |  |  |
Forfeited | (78,685 | ) |  | $ | 45.75 |  |  |  |  |
Balance as of June 30, 2015 | 1,772,410 |  |  | $ | 32.86 |  |  | 7.0 |  | $ | 120,588 |
Exercisable as of June 30, 2015 | 1,139,894 |  |  | $ | 23.62 |  |  | 6.1 |  | $ | 88,090 |
Options vested and expected to vest as of June 30, 2015 | 1,772,410 |  |  | $ | 32.86 |  |  | 7.0 |  | $ | 120,588 |
The weighted-average grant date fair value of all stock options granted during the six months ended June 30, 2015 was $33.66 per share. The total intrinsic value of all options exercised during the six months ended June 30, 2015 and 2014 was approximately $12.4 million and $13.7 million, respectively. As of June 30, 2015, there was $16.0 million of total unrecognized compensation cost related to nonvested stock options. That cost is expected to be recognized over a weighted-average period of 2.6 years. Net cash received from options exercised during the six months ended June 30, 2015 and 2014 was approximately $5.3 million and $3.6 million, respectively. There is no current tax benefit related to options exercised because of net operating losses for which a full valuation allowance has been established. As of June 30, 2015, 0.8 million shares were available for future option grants or direct issuance under the Company's 2002 Stock Incentive Plan, as amended. Restricted Stock Activity Restricted stock activity for the six months ended June 30, 2015 was as follows:
| Shares |  | Weighted- Average Grant Date Fair Value
Nonvested at December 31, 2014 | 82,673 |  |  | $ | 45.76 |
Granted | 100,954 |  |  | $ | 58.62 |
Vested | (48,066 | ) |  | $ | 44.78 |
Cancelled | (15,512 | ) |  | $ | 54.91 |
Nonvested at June 30, 2015 | 120,049 |  |  | $ | 55.79 |
Restricted stock awards generally vest over three years. As of June 30, 2015, there was $5.4 million of total unrecognized compensation cost related to nonvested restricted stock. That cost is expected to be recognized over a weighted-average period of 2.0 years. Employee Stock Purchase Plan The Company's Employee Stock Purchase Plan, as amended and restated (the "Amended ESPP") allows participants to purchase up to 1,250 shares of Ligand common stock during each offering period, but in no event may a participant purchase more than 1,250 shares of common stock during any calendar year. The length of each offering period is six months, and employees are eligible to participate in the first offering period beginning after their hire date. The Amended ESPP allows employees to purchase Ligand common stock at the end of each six month period at a price equal to 85% of the lesser of fair market value on either the start date of the period or the last trading day of the period (the "Lookback Provision"). The 15% discount and the Lookback Provision make the Amended ESPP compensatory. There were 2,654 and 2,230 shares of common stock issued under the amended ESPP during either of the six months ended June 30, 2015 and 2014, respectively. The Company recorded compensation expense related to the ESPP of $36,000 and $31,000 for the six months ended June 30, 2015 and 2014, respectively. As of June 30, 2015, 73,087 shares were available for future purchases under the Amended ESPP and 0.2 million shares of common stock had been issued under the Amended ESPP to employees. For shares purchased under the Company's Amended ESPP, a weighted-average expected volatility of 36% and 39% and an expected term of 6 months was used for the period ended June 30, 2015 and 2014, respectively.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d),(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Preferred Stock -URI http://asc.fasb.org/extlink&oid=6521494 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph d -Article 4 Reference 15: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 16: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 17: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Article 4 Reference 18: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section C Reference 19: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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