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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2014
Summarizes Activity of the Net Product Revenue Allowance and Reserve Categories | The following table summarizes activity in each of the net product revenue allowance and reserve categories described above for the years ended December 31, 2014 and 2013 (in thousands):
|  | Trade Allowances |  |  | Rebates, Chargebacks and Discounts |  |  | Product Returns |  |  | Other Incentives |  |  | Total |
Balance at January 1, 2014 |  | $ | 1,071 |  |  | $ | 1,137 |  |  | $ | 72 |  |  | $ | 189 |  |  | $ | 2,469 |
Provision related to current period sales |  |  | 8,157 |  |  |  | 12,753 |  |  |  | 397 |  |  |  | 11,153 |  |  |  | 32,460 |
Provision related to prior period sales |  |  | (29 | ) |  |  | (80 | ) |  |  | 12 |  |  |  | (31 | ) |  |  | (128 | )
Credits/payments made for current period sales |  |  | (5,950 | ) |  |  | (9,143 | ) |  |  | — |  |  |  | (10,338 | ) |  |  | (25,431 | )
Credits/payments made for prior period sales |  |  | (1,042 | ) |  |  | (1,057 | ) |  |  | — |  |  |  | (181 | ) |  |  | (2,280 | )
Balance at December 31, 2014 |  | $ | 2,207 |  |  | $ | 3,610 |  |  | $ | 481 |  |  | $ | 792 |  |  | $ | 7,090 |
|  | Trade Allowances |  |  | Rebates, Chargebacks and Discounts |  |  | Product Returns |  |  | Other Incentives |  |  | Total |
Balance at January 1, 2013 |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Provision related to current period and deferred sales |  |  | 4,178 |  |  |  | 4,282 |  |  |  | 72 |  |  |  | 3,114 |  |  |  | 11,646 |
Credits/payments made for current period and deferred sales |  |  | (3,107 | ) |  |  | (3,145 | ) |  |  | — |  |  |  | (2,925 | ) |  |  | (9,177 | )
Balance at December 31, 2013 |  | $ | 1,071 |  |  | $ | 1,137 |  |  | $ | 72 |  |  | $ | 189 |  |  | $ | 2,469 |
Product Revenue Recognized and Deferred | The following table summarizes product revenue recognized and deferred during the years ended December 31, 2014 and 2013 (in thousands):
|  | December 31, 2014 |  |  | December 31, 2013 |
Product revenue recognized, net |  | $ | 54,202 |  |  | $ | 26,351 |
Deferred product revenue |  |  | — |  |  |  | 1,703 |
|  | $ | 54,202 |  |  | $ | 28,054 |
Expensed and Capitalized Cost of Goods | In conjunction with the Company’s recognition and deferral of product revenues, the Company expensed and capitalized the associated cost of goods, as follows, during the years ended December 31, 2014 and 2013 (in thousands):
|  | December 31, 2014 |  |  | December 31, 2013 |
Cost of goods sold expensed |  | $ | 20,485 |  |  | $ | 11,912 |
Finished goods inventory held by others |  |  | — |  |  |  | 627 |
|  | $ | 20,485 |  |  | $ | 12,539 |
Summarizes the Impact of Accounts Receivable Reserves on Gross Trade Accounts Receivable | The following table summarizes the impact of accounts receivable reserves on the gross trade accounts receivable balances as of December 31, 2014 and 2013 (in thousands):
|  | December 31, 2014 |  |  | December 31, 2013 |
Gross trade accounts receivable |  | $ | 10,215 |  |  | $ | 4,812 |
Trade allowances |  |  | (2,207 | ) |  |  | (1,143 | )
Chargebacks |  |  | (166 | ) |  |  | (24 | )
Accounts receivable, net |  | $ | 7,842 |  |  | $ | 3,645 |
Estimated Useful Lives | The estimated useful lives, by asset classification, are as follows:
Asset Classification |  | Useful Lives
Computer equipment and software |  | 3 - 5 years
Furniture and fixtures |  | 5 years
Leasehold Improvements |  | Lesser of useful life or lease term
Net Income Loss and the Number of Shares Used to Compute Basic and Diluted Earnings per Share | The calculation of net loss and the number of shares used to compute basic and diluted earnings per share for the years ended December 31, 2014, 2013 and 2012 are as follows:
In thousands |  | 2014 |  |  | 2013 |  |  | 2012 |
Net loss—basic |  | $ | (56,364 | ) |  | $ | (166,227 | ) |  | $ | (179,184 | )
Gain on warrant derivative liability |  |  | (6,775 | ) |  |  | (47,936 | ) |  |  | — |
Net loss—diluted |  |  | (63,139 | ) |  |  | (214,163 | ) |  |  | (179,184 | )
Net loss per share—basic |  | $ | (0.32 | ) |  | $ | (1.03 | ) |  | $ | (1.24 | )
Weighted average shares outstanding—basic |  |  | 173,719 |  |  |  | 161,022 |  |  |  | 144,017 |
Effect of dilutive warrants |  |  | 105 |  |  |  | 6,048 |  |  |  | — |
Weighted average shares outstanding—diluted |  |  | 173,824 |  |  |  | 167,070 |  |  |  | 144,017 |
Net income loss per share—diluted |  | $ | (0.36 | ) |  | $ | (1.28 | ) |  | $ | (1.24 | )
Anti-Dilutive Securities Not Included in the Computation of Net Loss per Share | For the years ended December 31, 2014, 2013 and 2012, the following potentially dilutive securities were not included in the computation of net loss per share because the effect would be anti-dilutive:
In thousands |  | 2014 |  |  | 2013 |  |  | 2012 |
Stock options |  |  | 10,670 |  |  |  | 9,330 |  |  |  | 10,892 |
Restricted stock and restricted stock units |  |  | 2,256 |  |  |  | 196 |  |  |  | 465 |
Warrants |  |  | — |  |  |  | 1,702 |  |  |  | 9,937 |
Exchangeable senior notes (if converted) |  |  | 49,215 |  |  |  | 17,021 |  |  |  | 17,021 |
Assets and Liability Measured at Fair Value on a Recurring Basis | The following table presents information about the Company’s assets and liabilities as of December 31, 2014 and 2013 that are measured at fair value on a recurring basis and indicates the fair value hierarchy of the valuation techniques the Company utilized to determine such fair value:
|  | December 31, 2014 |
In thousands |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Asset: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents—money markets |  | $ | 65,156 |  |  | $ | 65,156 |  |  | $ | — |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant derivative liability |  | $ | 119 |  |  | $ | — |  |  | $ | — |  |  | $ | 119 |
Long-term debt derivative liabilities |  | $ | 7,400 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,400 |
|  | December 31, 2013 |
In thousands |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Asset: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents—money markets |  | $ | 113,474 |  |  | $ | 113,474 |  |  | $ | — |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant derivative liability |  | $ | 6,894 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,894 |
Long-term debt derivative liability |  | $ | 11,100 |  |  | $ | — |  |  | $ | — |  |  | $ | 11,100 |
Carrying Amounts and Estimated Fair Values of Debt Instruments | The carrying amounts and the estimated fair values of debt instruments as of December 31, 2014 and 2013 are as follows:
|  | December 31, 2014 |  |  | December 31, 2013 |
In thousands |  | Carrying Value |  |  | Estimated Fair Value |  |  | Carrying Value |  |  | Estimated Fair Value |
Long-term debt—December 2012 financing |  | $ | 89,617 |  |  | $ | 81,000 |  |  | $ | 87,717 |  |  | $ | 75,700 |
2012 Notes |  |  | 31,266 |  |  |  | 25,689 |  |  |  | 149,317 |  |  |  | 106,600 |
2014 Notes |  |  | 90,580 |  |  |  | 75,533 |  |  |  | — |  |  |  | — |
Change in Fair Value of Derivative Liabilities | The change in the fair value of derivative liabilities is as follows (in thousands):
|  | October 2009 Warrants |  |  | Long-Term Debt Derivative Liabilities |  |  | Totals |
Balance at December 31, 2012 |  | $ | 54,854 |  |  | $ | 14,577 |  |  | $ | 69,431 |
Gain on change in fair value of derivative liabilities |  |  | (44,233 | ) |  |  | (3,477 | ) |  |  | (47,710 | )
Compensation income for change in fair value of warrants issued to former employees |  |  | (3,703 | ) |  |  | — |  |  |  | (3,703 | )
Transfers to equity |  |  | (24 | ) |  |  | — |  |  |  | (24 | )
Balance at December 31, 2013 |  | $ | 6,894 |  |  | $ | 11,100 |  |  | $ | 17,994 |
Record initial fair value of derivative liability on 2014 senior notes |  |  | — |  |  |  | 3,500 |  |  |  | 3,500 |
Gain on change in fair value of derivative liabilities |  |  | (6,272 | ) |  |  | (7,200 | ) |  |  | (13,472 | )
Compensation income for change in fair value of warrants issued to former employees |  |  | (503 | ) |  |  | — |  |  |  | (503 | )
Balance at December 31, 2014 |  | $ | 119 |  |  | $ | 7,400 |  |  | $ | 7,519 |

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