Debt	9 Months Ended
Sep. 30, 2016
Debt Disclosure [Abstract]
Debt	Debt. On March 15, 2016, the company issued $190 million aggregate principal amount of Convertible Senior Notes due 2021 (the notes). On April 13, 2016, the company issued an additional $23.5 million of the notes pursuant to an over-allotment option exercised by the initial purchasers to buy additional notes, for a total of $213.5 million of notes issued. The notes, which are senior unsecured obligations, bear interest at a coupon rate of 5.50% (or 9.5% effective interest rate) per year until maturity, payable semiannually in arrears on March 1 and September 1 of each year, beginning on September 1, 2016. The notes are not redeemable prior to maturity and are convertible into shares of the company’s common stock. The conversion rate for the notes is 102.4249 shares of the company’s common stock per $1,000 principal amount of the notes (or a total amount of 21,867,716 shares), which is equivalent to an initial conversion price of approximately $9.76 per share of the company’s common stock. Upon any conversion, the company will settle its conversion obligation in cash, shares of its common stock, or a combination of cash and shares of its common stock, at its election. In connection with the issuances of the notes, the company also paid $27.3 million to enter into privately negotiated capped call transactions with the initial purchasers and/or affiliates of the initial purchasers. The capped call transactions will cover, subject to customary anti-dilution adjustments, the number of shares of the company’s common stock that will initially underlie the notes. The capped call transactions are expected to reduce potential dilution to the company’s common stock and/or offset potential cash payments the company is required to make in excess of the principal amount upon any conversion of the notes. In accordance with Accounting Standards Codification 470-20, a convertible debt instrument that may be settled entirely or partially in cash is required to be separated into a liability and equity component, such that interest expense reflects the issuer’s non-convertible debt interest rate. Upon issuance, (i) a debt discount of $33.6 million was recognized as a decrease in debt and an increase in additional-paid in capital and (ii) the cost of the capped call transactions of $27.3 million was recognized as a decrease in cash and a decrease in additional paid-in capital. The debt component will accrete up to the principal amount and will be recognized as non-cash interest expense over the expected term of the notes. For the three and nine months ended September 30, 2016, $4.6 million and $9.9 million, respectively, was recorded as interest expense on such convertible debt, which includes the contractual interest coupon, amortization of the debt discount, and amortization of the debt issuance costs.

Debt.

On March 15, 2016, the company issued $190 million aggregate principal amount of Convertible Senior Notes due 2021 (the notes). On April 13, 2016, the company issued an additional $23.5 million of the notes pursuant to an over-allotment option exercised by the initial purchasers to buy additional notes, for a total of $213.5 million of notes issued. The notes, which are senior unsecured obligations, bear interest at a coupon rate of 5.50% (or 9.5% effective interest rate) per year until maturity, payable semiannually in arrears on March 1 and September 1 of each year, beginning on September 1, 2016. The notes are not redeemable prior to maturity and are convertible into shares of the company’s common stock. The conversion rate for the notes is 102.4249 shares of the company’s common stock per $1,000 principal amount of the notes (or a total amount of 21,867,716 shares), which is equivalent to an initial conversion price of approximately $9.76 per share of the company’s common stock. Upon any conversion, the company will settle its conversion obligation in cash, shares of its common stock, or a combination of cash and shares of its common stock, at its election.

In connection with the issuances of the notes, the company also paid $27.3 million to enter into privately negotiated capped call transactions with the initial purchasers and/or affiliates of the initial purchasers. The capped call transactions will cover, subject to customary anti-dilution adjustments, the number of shares of the company’s common stock that will initially underlie the notes. The capped call transactions are expected to reduce potential dilution to the company’s common stock and/or offset potential cash payments the company is required to make in excess of the principal amount upon any conversion of the notes.

In accordance with Accounting Standards Codification 470-20, a convertible debt instrument that may be settled entirely or partially in cash is required to be separated into a liability and equity component, such that interest expense reflects the issuer’s non-convertible debt interest rate. Upon issuance, (i) a debt discount of $33.6 million was recognized as a decrease in debt and an increase in additional-paid in capital and (ii) the cost of the capped call transactions of $27.3 million was recognized as a decrease in cash and a decrease in additional paid-in capital. The debt component will accrete up to the principal amount and will be recognized as non-cash interest expense over the expected term of the notes. For the three and nine months ended September 30, 2016, $4.6 million and $9.9 million, respectively, was recorded as interest expense on such convertible debt, which includes the contractual interest coupon, amortization of the debt discount, and amortization of the debt issuance costs.