Subsequent Events	3 Months Ended
Mar. 31, 2020
Subsequent Events
Subsequent Events	13. Subsequent Events In April 2020, the Company executed a purchase agreement for the sale of $287.5 million aggregate principal amount of its 2.25% Convertible Senior Notes due 2027 to the initial purchasers in a private placement and for initial resale to qualified institutional buyers pursuant to the exemption from registration provided by Rule 144A under the Securities Act. A maximum of 9,634,700 shares of the Company’s common stock may be issued upon conversion of the Convertible Notes, subject to adjustment. The net proceeds from the offering of the Convertible Notes, given the initial purchasers’ full exercise of their option to purchase additional Convertible Notes, were approximately $278.9 million net of the underwriting discount. In April 2020, the Company used a portion of the net proceeds from the offering of the Convertible Notes to repay its obligations under its 2017 Term Loan with OrbiMed. The payoff amount was $79.2 million, which includes the principal amount of $75.0 million and $4.2 million of early payment penalties and accrued interest through the payment date.

Subsequent Events

3 Months Ended

Mar. 31, 2020

13. Subsequent Events

In April 2020, the Company executed a purchase agreement for the sale of $287.5 million aggregate principal amount of its 2.25% Convertible Senior Notes due 2027 to the initial purchasers in a private placement and for initial resale to qualified institutional buyers pursuant to the exemption from registration provided by Rule 144A under the Securities Act. A maximum of 9,634,700 shares of the Company’s common stock may be issued upon conversion of the Convertible Notes, subject to adjustment. The net proceeds from the offering of the Convertible Notes, given the initial purchasers’ full exercise of their option to purchase additional Convertible Notes, were approximately $278.9 million net of the underwriting discount.

In April 2020, the Company used a portion of the net proceeds from the offering of the Convertible Notes to repay its obligations under its 2017 Term Loan with OrbiMed. The payoff amount was $79.2 million, which includes the principal amount of $75.0 million and $4.2 million of early payment penalties and accrued interest through the payment date.