v2.4.1.9

Warrants | 12 Months Ended
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Dec. 31, 2014
Text Block [Abstract] |
Warrants | 9. WARRANTS At December 31, 2013, outstanding convertible preferred stock warrants consisted of:
Issue Date |  | Original Term |  |  | Convertible Preferred Stock |  |  | Exercise Price |  |  | Number of Shares of Outstanding Underlying Warrant |  |  | Estimated Fair Value as of December 31, 2013 (In thousands) |
December 2010 (a) |  |  | 7 years |  |  |  | Series G |  |  | $ | 21.78 |  |  |  | 17,215 |  |  | $ | 14 |
April 2012 (b) |  |  | 5 years |  |  |  | Series G |  |  | $ | 21.78 |  |  |  | 357,216 |  |  |  | 218 |
August 2012 (c) |  |  | 7 years |  |  |  | Series G |  |  | $ | 21.78 |  |  |  | 167,182 |  |  |  | 293 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  | 541,613 |  |  | $ | 525 |
(a)—Issued | to lenders in connection with the 2010 Loan (see Note 8).
(b)—Issued | to note holders upon the conversion of all of the 2010 Notes (see Note 8).
(c)—Issued | to lenders in connection with the 2012 Loan (see Note 8).
The warrants were exercisable upon issuance. At December 31, 2013, the warrants were classified as liabilities on the balance sheet. Upon the completion of the Company’s IPO in July 2014, all outstanding convertible preferred stock warrants were converted into warrants to purchase common stock and accordingly the liability was reclassified to stockholders’ equity. Prior to the IPO, the Company adjusted the liability for changes in fair value at each balance sheet date. The estimated fair value of the outstanding convertible preferred stock warrants was measured at December 31, 2013, using the Black-Scholes option pricing model with the following assumptions: expected volatility ranging from 40% to 45%, a contractual term equal to the remaining contractual term, risk-free interest rate ranging from 0.8% to 2.1%, underlying common stock price of $8.97, and dividend yield of 0%. In October 2011, a number of preferred stock holders did not purchase their pro rata share of the 2010 Notes, and as a result, 82,190 warrants to purchase Series E, F, and G preferred stock converted to warrants to purchase common stock. The strike price of the warrants remained the same. At December 31, 2013, outstanding common stock warrants consisted of:
|  | Original Term |  |  | Exercise Price |  |  | Number of Shares Outstanding Underlying Warrants |
Original issue date: |  |  |  |  |  |  |  |  |  |  |  |
July 2006 |  |  | 10 years |  |  | $ | 31.72 |  |  |  | 17,656 |
November 2006 |  |  | 10 years |  |  | $ | 31.72 |  |  |  | 1,576 |
February 2008 |  |  | 10 years |  |  | $ | 35.07 |  |  |  | 22,792 |
August 2009 |  |  | 10 years |  |  | $ | 21.78 |  |  |  | 33,472 |
July 2010 |  |  | 9 years |  |  | $ | 21.78 |  |  |  | 6,694 |
|  |  |  |  |  |  |  |  |  |  | 82,190 |

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