Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2019

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 March 31, 2019 and December 31, 2018:

In thousands	March 31, 2019			December 31, 2018
Gross trade accounts receivable	$	104,011		$	86,133
Trade allowances		(23,992	)		(19,495	)
Chargebacks		(534	)		(115	)
Accounts receivable, net	$	79,485		$	66,523

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 three months ended March 31, 2019 and 2018  are as follows:

	Three months ended March 31,
In thousands	2019			2018
Net loss—basic and diluted	$	(24,431	)	$	(24,095	)
Weighted average shares outstanding—basic and diluted		328,712			285,207
Net loss per share—basic and diluted	$	(0.07	)	$	(0.08	)

Anti-Dilutive Securities Not Included in the Computation of Net Loss or Earnings per Share

For the three months ended March 31, 2019 and 2018, the following potentially dilutive securities were not included in the computation of net loss per share because the effect would be anti-dilutive:

	Three months ended March 31,
In thousands	2019		2018
Stock options		16,837		25,703
Restricted stock and restricted stock units		9,341		12,420
Exchangeable senior notes (if converted)		—		7,716
Preferred stock (if converted)		28,932		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 March 31, 2019 and December 31, 2018 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:

	March 31, 2019
In thousands	Total		Level 1		Level 2		Level 3
Asset:
Cash equivalents—money markets	$	9,945	$	9,945	$	—	$	—

	December 31, 2018
In thousands	Total		Level 1		Level 2		Level 3
Asset:
Cash equivalents—money markets	$	9,880	$	9,880	$	—	$	—

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 March 31, 2019 and December 31, 2018 are as follows:

	March 31, 2019				December 31, 2018
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	$	38,394			$	33,602
Long-term debt from royalty-bearing instrument		35,338				46,108
Total long-term debt from royalty-bearing instrument	$	73,732	$	72,600	$	79,710	$	78,600