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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Summary of Impact of Accounts Receivable Reserves on Gross Trade Accounts Receivable Balances | The following table summarizes the impact of accounts receivable reserves on the gross trade accounts receivable balances as of December 31, 2018 and 2017:
In thousands |  | December 31, 2018 |  |  | December 31, 2017 |
Gross trade accounts receivable |  | $ | 86,133 |  |  | $ | 57,802 |
Trade allowances |  |  | (19,495 | ) |  |  | (12,035 | )
Chargebacks |  |  | (115 | ) |  |  | (449 | )
Accounts receivable, net |  | $ | 66,523 |  |  | $ | 45,318 |
Summary of Estimated Useful Lives, by Asset Classification | 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
Calculation of Net Loss and Number of Shares Used to Compute Basic and Diluted Net Loss per Share | The calculation of net loss and the number of shares used to compute basic and diluted net loss per share for the years ended December 31, 2018, 2017 and 2016 are as follows:
In thousands |  | 2018 |  |  | 2017 |  |  | 2016 |
Net loss—basic and diluted |  | $ | (116,445 | ) |  | $ | (67,865 | ) |  | $ | (86,350 | )
Weighted average shares outstanding—basic and diluted |  |  | 297,237 |  |  |  | 270,652 |  |  |  | 211,874 |
Net loss per share—basic and diluted |  | $ | (0.39 | ) |  | $ | (0.25 | ) |  | $ | (0.41 | )
Anti-Dilutive Securities Not Included in the Computation of Net Loss or Earnings per Share | For the years ended December 31, 2018, 2017 and 2016, 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 |  | 2018 |  |  | 2017 |  |  | 2016 |  |
Stock options |  |  | 19,263 |  |  |  | 24,108 |  |  |  | 21,188 |  |
Restricted stock and restricted stock units |  |  | 9,633 |  |  |  | 12,006 |  |  |  | 10,143 |  |
Exchangeable senior notes (if converted) |  |  | — |  |  |  | 7,716 |  |  |  | 1,714 |  |
Preferred stock (if converted) |  |  | 28,932 |  |  |  | 32,818 |  |  |  | 32,818 |  |
Assets and Liability Measured at Fair Value on a Recurring Basis | The following tables present information about the Company’s assets and liabilities as of December 31, 2018 and 2017 that are measured at fair value on a recurring basis and indicate the fair value hierarchy of the valuation techniques the Company utilized to determine such fair value:
|  | December 31, 2018 |
In thousands |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Asset: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents—money markets |  | $ | 9,880 |  |  | $ | 9,880 |  |  | $ | — |  |  | $ | — |
|  | December 31, 2017 |
In thousands |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Asset: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents—money markets |  | $ | 9,317 |  |  | $ | 9,317 |  |  | $ | — |  |  | $ | — |
Carrying Amounts and Estimated Fair Values of Debt Instruments | The carrying amounts of cash, cash equivalents, accounts payable and accrued liabilities approximate fair value because of their short-term nature. The carrying amounts and the estimated fair values of debt instruments as of December 31, 2018 and 2017 are as follows:
|  | December 31, 2018 |  |  | December 31, 2017 |
In thousands |  | Carrying Value |  |  | Estimated Fair Value |  |  | Carrying Value |  |  | Estimated Fair Value |
Current portion of long-term debt from royalty-bearing instrument, net of accrued interest |  | $ | 33,602 |  |  |  |  |  |  | $ | 21,569 |  |  |  |  |
Long-term debt from royalty-bearing instrument |  |  | 46,108 |  |  |  |  |  |  |  | 70,834 |  |  |  |  |
Total long-term debt from royalty-bearing instrument |  | $ | 79,710 |  |  | $ | 78,600 |  |  | $ | 92,403 |  |  | $ | 88,000 |
2017 Notes |  |  | — |  |  |  | — |  |  |  | 28,992 |  |  |  | 38,200 |

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