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Capitalization | 9 Months Ended
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Sep. 30, 2019
Stockholders' Equity Note [Abstract] |
Capitalization | Capitalization In January 2019, the Company closed an underwritten public offering of its common stock pursuant to a registration statement on Form S-3. The Company issued and sold an aggregate of 7,563,725 shares of common stock under the registration statement at a public offering price of $30.20 per share, including 843,725 shares issued upon exercise by the underwriter of its option to purchase additional shares in February 2019. The Company received net proceeds of $224.2 million after deducting underwriting discounts and commissions and other offering expenses payable by the Company. In August 2019, the Company entered into an At the Market Offering Sales Agreement (the “Sales Agreement”) with Cantor Fitzgerald and RBC Capital Markets, LLC (together, the “Sales Agents”), pursuant to which, the Company may offer and sell shares of its common stock, having an aggregate offering price of up to $125.0 million from time to time through the Sales Agents by any method that is deemed to be an “at the market offering” as defined in Rule 415(a)(4) promulgated under the Securities Act of 1933, as amended. During the three month period ending September 30, 2019, the Company issued and sold an aggregate of 63,926 shares of common stock pursuant to the Sales Agreement at a weighted average public offering price of $46.60 per share. The Company received net proceeds of $2.6 million after deducting underwriting discounts and commissions and other offering expenses payable by the Company. In September 2019, the Company closed an underwritten public offering of its common stock pursuant to a registration statement on Form S-3. The Company issued and sold an aggregate of 2,475,248 shares of common stock under the registration statement at a public offering price of $40.40 per share. The offering included an option to purchase up to an additional 371,287 shares for a period of 30 days following the offering. This option was not exercised by the underwriter. The Company received net proceeds of $97.0 million after deducting underwriting discounts and commissions and other offering expenses payable by the Company. Warrants During the three month period ended September 30, 2019, all of the Company’s outstanding warrants expired, and the Company wrote off the remaining liability, which was immaterial. As of December 31, 2018, all of the Company's outstanding warrants were classified as liabilities because they contained non-standard antidilution provisions. The fair value of the warrants as of December 31, 2018 was immaterial. The following is a summary of the Company’s outstanding warrants as of December 31, 2018:
|  | Warrant shares |  | Exercise price |  | Expiration
Common stock |  | 7,030 |  |  | $ | 128.00 |  |  | September 2019
Common stock |  | 130 |  |  | $ | 2,520.00 |  |  | August 2019

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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 + Details
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