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Capitalization | 3 Months Ended
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Mar. 31, 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 $224.4 million after deducting underwriting discounts and commissions and other offering expenses payable by the Company. Warrants All of the Company’s outstanding warrants were classified as liabilities as of March 31, 2019 and December 31, 2018 because they contained non-standard antidilution provisions. The fair value of the warrants as of March 31, 2019 and December 31, 2018 was immaterial. The following is a summary of the Company’s outstanding warrants as of March 31, 2019 and 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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