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Shareholders' Equity	6 Months Ended
	Jun. 30, 2020
Equity [Abstract]
Shareholders' Equity	Shareholders’ Equity Common Stock — As of June 30, 2020, the Company had 500,000,000 shares of common stock authorized with a par value of $0.01 per share and 101,434,104 shares of common stock issued and outstanding. In addition, as of June 30, 2020, the Company had reserved 13,271,513 shares of common stock for issuance upon the exercise of outstanding stock options and 868,210 shares of common stock for issuance upon the vesting of RSUs. The Company has also reserved 11,492,280 shares of common stock for issuance upon conversion of the Convertible Notes, subject to adjustment in accordance with the Indenture. In the second quarter of 2020, the Company completed an underwritten public offering of 11,155,000 shares of the Company's common stock, including 1,455,000 shares issued pursuant to the exercise in full of the underwriters' option to purchase additional shares from the Company, at a public offering price of $23.25 per share. The Company's net proceeds from the sale of the shares, after deducting the underwriting discounts and offering expenses of $13.4 million, were $245.9 million. In the second quarter of 2019, the Company completed an underwritten public offering of 10,657,692 shares of the Company's common stock, including 1,042,307 shares issued pursuant to the exercise in full of the underwriters' option to purchase additional shares at a public offering price of $26.00 per share. The Company's net proceeds from the sale of the shares, after deducting the underwriting discounts and offering expenses of $16.0 million, were $261.1 million. The offering also included 400,000 shares sold by the Company's Chairman and Chief Executive Officer, from which the Company received no proceeds. Preferred Stock — As of June 30, 2020, the Company had 200,000,000 shares of preferred stock authorized with a par value of $0.01 per share and no shares of preferred stock were issued and outstanding.

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- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-URI http://asc.fasb.org/topic&trid=2208762

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