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FINANCIAL INSTRUMENTS | 6 Months Ended
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Jun. 30, 2017
Fair Value Disclosures [Abstract] |
FINANCIAL INSTRUMENTS | FINANCIAL INSTRUMENTS Fair Value Measurements Fair value is defined as the price that would be received to sell an asset or be paid to transfer a liability in the principal or most advantageous market in an orderly transaction. To increase consistency and comparability in fair value measurements, the FASB established a three-level hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The three levels of fair value measurements are:
• | Level 1—Quoted prices (unadjusted) in active markets that are accessible at the measurement date for assets or liabilities. The fair value hierarchy gives the highest priority to Level 1 inputs.
• | Level 2—Observable prices that are based on inputs not quoted on active markets, but corroborated by market data.
• | Level 3—Unobservable inputs that are used when little or no market data is available. The fair value hierarchy gives the lowest priority to Level 3 inputs.
The carrying value of financial instruments including cash and cash equivalents, accounts receivable and accounts payable approximate their respective fair values due to the short-term nature of these items. The fair value of the Company’s convertible senior notes at June 30, 2017 are calculated utilizing market quotations from an over-the-counter trading market for these instruments (Level 2). The carrying amount and fair value of the 2019 Notes and 2022 Notes are as follows (in thousands):
Financial Liabilities Carried at Historical Cost |  | Carrying Value |  | Fair Value Measurements Using
June 30, 2017 |  |  | Level 1 |  | Level 2 |  | Level 3
2.375% convertible senior notes due 2022 (1) |  | $ | 269,238 |  |  | $ | — |  |  | $ | 368,072 |  |  | $ | — |
3.25% convertible senior notes due 2019 (2) |  | $ | 319 |  |  | $ | — |  |  | $ | 654 |  |  | $ | — |
(1) The closing price of the Company’s common stock was $47.70 per share at June 30, 2017 compared to a conversion price of $66.89 per share. Currently, the conversion price is above the stock price. The maximum conversion premium that can be due on the 2022 Notes is approximately 5.2 million shares, which assumes no increases in the conversion rate for certain corporate events. (2) The closing price of the Company’s common stock was $47.70 per share at June 30, 2017 compared to a conversion price of $24.82 per share which, if converted, would result in an approximate conversion premium of less than 0.1 million shares or $0.3 million of cash. The maximum conversion premium that can be due on the 2019 Notes is less than 0.1 million shares, which assumes no increases in the conversion rate for certain corporate events. Short-term investments consist of asset-backed securities collateralized by credit card receivables, investment grade commercial paper and corporate bonds with maturities less than one year. The net unrealized gains and losses from the Company’s short-term investments are reported in other comprehensive income (loss). At June 30, 2017, all of the Company’s short-term investments are classified as available for sale investments and are determined to be Level 2 instruments, which are measured at fair value using standard industry models with observable inputs. The fair value of the commercial paper is measured based on a standard industry model that uses the three-month Treasury bill rate as an observable input. The fair value of the asset-backed securities and corporate bonds is principally measured or corroborated by trade data for identical issues in which related trading activity is not sufficiently frequent to be considered a Level 1 input or that of comparable securities. At June 30, 2017, the Company’s short-term investments were rated A or better by Standard & Poor’s. The following summarizes the Company’s investments at June 30, 2017 and December 31, 2016 (in thousands):
June 30, 2017 Debt Securities |  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value (Level 2)
Short-term: |  |  |  |  |  |  |  |
Asset-backed securities |  | $ | 69,984 |  |  | $ | — |  |  | $ | (15 | ) |  | $ | 69,969 |
Commercial paper |  | 35,896 |  |  | 3 |  |  | (1 | ) |  | 35,898 |
Corporate bonds |  | 222,812 |  |  | 21 |  |  | (72 | ) |  | 222,761 |
Total |  | $ | 328,692 |  |  | $ | 24 |  |  | $ | (88 | ) |  | $ | 328,628 |
December 31, 2016 Debt Securities |  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value (Level 2)
Short-term: |  |  |  |  |  |  |  |
Asset-backed securities |  | $ | 9,012 |  |  | $ | — |  |  | $ | (2 | ) |  | $ | 9,010 |
Commercial paper |  | 39,530 |  |  | 8 |  |  | (15 | ) |  | 39,523 |
Corporate bonds |  | 88,141 |  |  | 11 |  |  | (32 | ) |  | 88,120 |
Total |  | $ | 136,683 |  |  | $ | 19 |  |  | $ | (49 | ) |  | $ | 136,653 |
Certain assets and liabilities are measured at fair value on a nonrecurring basis, including assets and liabilities acquired in a business combination and long-lived assets, which would be recognized at fair value if deemed to be impaired or if reclassified as assets held for sale. The fair value in these instances would be determined using Level 3 inputs. At June 30, 2017, the Company had no financial instruments that were measured using Level 3 inputs. Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents, short-term investments and accounts receivable. The Company maintains its cash and cash equivalents with high-credit quality financial institutions. Such amounts may exceed federally-insured limits. As of June 30, 2017, three customers each accounted for over 10% of the Company’s accounts receivable, at 34%, 29% and 27%, respectively. At December 31, 2016, three customers each accounted for over 10% of the Company’s accounts receivable, at 36%, 29% and 25%, respectively (for additional information regarding the Company’s customers, see Note 2, Summary of Significant Accounting Policies). Revenues are primarily derived from major wholesalers and pharmaceutical companies that generally have significant cash resources. The Company performs ongoing credit evaluations of its customers as warranted and generally does not require collateral. Allowances for doubtful accounts receivable are maintained based on historical payment patterns, aging of accounts receivable and the Company’s actual write-off history. As of June 30, 2017 and December 31, 2016, no allowances for doubtful accounts were deemed necessary by the Company on its accounts receivable.

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- Definition The entire disclosure for financial instruments. This disclosure includes, but is not limited to, fair value measurements of short and long term marketable securities, international currencies forward contracts, and auction rate securities. Financial instruments may include hedging and non-hedging currency exchange instruments, derivatives, securitizations and securities available for sale at fair value. Also included are investment results, realized and unrealized gains and losses as well as impairments and risk management disclosures. + References No definition available. + Details
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