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Stockholders' Equity | 12 Months Ended
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Dec. 31, 2015
Stockholders' Equity |
5. | Stockholders’ Equity
Common Stock and Warrants At December 31, 2013, the Company has reserved 4,005,174 shares of common stock pursuant to the Plans, as described below. On April 6, 2007, the Company issued warrants to an individual at Scripps to purchase up to 150,000 shares of common stock at $0.01 per share, as discussed in Note 10. The warrants have a seven-year term and are exercisable based on performance criteria as detailed in the warrant agreement during 2014. The warrant expired prior to the performance criteria being achieved. Stock-Based Compensation The Company recorded stock-based compensation expense of approximately $3,598,000, $1,766,000 and $1,060,000 for the years ended December 31, 2015, 2014 and 2013, respectively, for share-based awards granted under the Second Amended and Restated 2001 Repligen Corporation Stock Plan (the “2001 Plan”) and the Repligen Corporation 2012 Stock Option and Incentive Plan (the “2012 Plan,” and collectively with the 2001 Plan and the 1992 Repligen Corporation Stock Option Plan, the “Plans”). The following table presents stock-based compensation expense in the Company’s consolidated statements of operations (in thousands):
|  | Years ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Cost of product revenue |  | $ | 213 |  |  | $ | 128 |  |  | $ | 74 |
Research and development |  |  | 336 |  |  |  | 185 |  |  |  | 97 |
Selling, general and administrative |  |  | 3,049 |  |  |  | 1,453 |  |  |  | 889 |
Total |  | $ | 3,598 |  |  | $ | 1,766 |  |  | $ | 1,060 |
During 2015, the Company modified certain stock option grants for its former president and chief executive officer in conjunction with his retirement. As part of the January 2015 transition agreement, all outstanding equity awards continued to vest through December 31, 2015, and fifty percent (50%) of the option awards that are unvested on December 31, 2015 immediately vested and became exercisable as of that date. As a result of these modifications to his share-based payment arrangements, the Company incurred stock compensation expense of $826,000 for the year ended December 31, 2015. This expense was recorded to selling, general and administrative expense on the Company’s consolidated statement of operations. The 2012 Plan allows for the granting of incentive and nonqualified options to purchase shares of common stock, restricted stock and other equity awards. Incentive options granted to employees under the Plans generally vest over a three to five-year period, with 20%-33% vesting on the first anniversary of the date of grant and the remainder vesting in equal yearly installments thereafter. Nonqualified options issued to non-employee directors and consultants under the Plans generally vest over one year. Options granted under the Plans have a maximum term of ten years from the date of grant and generally, the exercise price of the stock options equals the fair market value of the Company’s common stock on the date of grant. At December 31, 2015, options to purchase 1,240,935 shares were outstanding under the Plans. At December 31, 2015, 2,441,761 shares were available for future grant under the 2012 Plan. The Company uses the Black-Scholes option pricing model to calculate the fair value of share-based awards on the grant date. The fair value of share-based awards granted during the years ended December 31, 2015, 2014 and 2013 were calculated using the following estimated assumptions:
|  | 2015 |  | 2014 |  | 2013
Expected term (years) |  | 6.6 -7.2 |  | 6.5 |  | 6.5
Volatility |  | 50.09 - 51.89% |  | 51.00 - 51.71% |  | 51.39% - 53.63%
Risk-free interest rate |  | 1.67 – 2.03% |  | 1.88 - 2.11% |  | 1.09% - 2.08%
Expected dividend yield |  | — |  | — |  | —
Information regarding option activity for the year ended December 31, 2015 under the Plans is summarized below:
|  | Options Outstanding |  |  | Weighted- Average Exercise Price Per Share |  |  | Weighted- Average Remaining Contractual Term (in years) |  |  | (in thousands) Aggregate Intrinsic Value |
Options outstanding at December 31, 2014 |  |  | 1,225,117 |  |  | $ | 8.31 |  |  |  |  |  |  |  |  |
Granted |  |  | 310,857 |  |  |  | 15.23 |  |  |  |  |  |  |  |  |
Exercised |  |  | (177,693 | ) |  |  | 5.22 |  |  |  |  |  |  |  |  |
Forfeited/cancelled |  |  | (117,346 | ) |  |  | 8.81 |  |  |  |  |  |  |  |  |
Options outstanding at December 31, 2015 |  |  | 1,240,935 |  |  | $ | 10.44 |  |  |  | 6.42 |  |  | $ | 22,653 |
Options exercisable at December 31, 2015 |  |  | 559,922 |  |  | $ | 6.77 |  |  |  | 3.89 |  |  | $ | 12,048 |
Vested and expected to vest at December 31, 2015 (1) |  |  | 1,183,574 |  |  | $ | 10.42 |  |  |  | 6.36 |  |  | $ | 21,652 |
(1) | This represents the number of vested options as of December 31, 2015 plus the number of unvested options expected to vest as of December 31, 2015 based on the unvested outstanding options at December 31, 2015 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.
The aggregate intrinsic value in the table above represents the total pre-tax intrinsic value (the difference between the closing price of the common stock on December 31, 2015 of $28.29 per share and the exercise price of each in-the-money option) that would have been received by the option holders had all option holders exercised their options on December 31, 2015. The aggregate intrinsic value of stock options exercised during the years ended December 31, 2015, 2014 and 2013 was approximately $4,942,000, $10,475,000 and $3,723,000, respectively. The weighted average grant date fair value of options granted during the years ended December 31, 2015, 2014 and 2013 was $22.45, $11.12 and $4.31, respectively. The total fair value of stock options that vested during the years ended December 31, 2015, 2014 and 2013 was approximately $2,317,000, $1,084,000 and $991,000, respectively. As of December 31, 2015, there was $6,547,000 of total unrecognized compensation cost related to unvested share-based awards. This cost is expected to be recognized over a weighted average remaining requisite service period of 3.08 years. The Company expects 623,652 unvested options to vest over the next five years.

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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 Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 15: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section C + Details
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