Stockholders' Equity	6 Months Ended
Jun. 30, 2019
Equity [Abstract]
Stockholders' Equity	9. Stockholders’ Equity On July 29, 2019, the Company issued and sold 6,325,000 shares of its common stock in a follow-on public offering, which includes the full exercise of the underwriters’ option to purchase 825,000 additional shares of common stock. The Company received net proceeds of approximately $136,446, after deducting $9,029 of underwriting discounts and commissions and estimated offering expenses payable by the Company. This offering was made pursuant to the Company’s Registration Statement on Form S-3 (File No. 333-230333), or the Shelf Registration Statement, filed with the SEC on March 15, 2019 and declared effective on April 4, 2019, and a related prospectus supplement dated July 24, 2019, which was filed with the SEC on July 25, 2019 (see Note 16, Subsequent Events). The Shelf Registration Statement provides for aggregate offerings of up to $300,000 of common stock, preferred stock, debt securities, warrants or any combination thereof. The securities registered under the Shelf Registration Statement include unsold securities that had been registered under the Company’s previous shelf registration statement (File No. 333-216657) that was declared effective on March 24, 2017. In May 2019, as a result of the achievement of a clinical performance target, an aggregate of 74,166 restricted stock units of various executive officers vested and were settled in shares of the Company’s common stock (see Note 13, Stock-Based Compensation). On March 20, 2019, or the Effective Date, the Company entered into a consulting agreement with an existing stockholder. In accordance with the agreement, the stockholder will provide various consulting services to the Company in exchange for 10,195 unregistered shares of the Company’s common stock. The closing price of the Company’s common stock on the Effective Date was $19.37. The services to be provided by the consultant are expected to be performed during the six-month period following the Effective Date. Accordingly, the prepaid expense of $197 related to this stock issuance will be amortized on a straight-line basis as stock compensation expense within general and administrative expenses over the six-month period as services are performed. During the three and six months ended June 30, 2019, $99 of stock-based compensation expense was recognized in the Statements of Comprehensive Loss, all of which related to G&A expense.

Stockholders' Equity

6 Months Ended

Jun. 30, 2019

9. Stockholders’ Equity

On July 29, 2019, the Company issued and sold 6,325,000 shares of its common stock in a follow-on public offering, which includes the full exercise of the underwriters’ option to purchase 825,000 additional shares of common stock. The Company received net proceeds of approximately $136,446, after deducting $9,029 of underwriting discounts and commissions and estimated offering expenses payable by the Company. This offering was made pursuant to the Company’s Registration Statement on Form S-3 (File No. 333-230333), or the Shelf Registration Statement, filed with the SEC on March 15, 2019 and declared effective on April 4, 2019, and a related prospectus supplement dated July 24, 2019, which was filed with the SEC on July 25, 2019 (see Note 16, Subsequent Events). The Shelf Registration Statement provides for aggregate offerings of up to $300,000 of common stock, preferred stock, debt securities, warrants or any combination thereof. The securities registered under the Shelf Registration Statement include unsold securities that had been registered under the Company’s previous shelf registration statement (File No. 333-216657) that was declared effective on March 24, 2017.

In May 2019, as a result of the achievement of a clinical performance target, an aggregate of 74,166 restricted stock units of various executive officers vested and were settled in shares of the Company’s common stock (see Note 13, Stock-Based Compensation).

On March 20, 2019, or the Effective Date, the Company entered into a consulting agreement with an existing stockholder. In accordance with the agreement, the stockholder will provide various consulting services to the Company in exchange for 10,195 unregistered shares of the Company’s common stock. The closing price of the Company’s common stock on the Effective Date was $19.37. The services to be provided by the consultant are expected to be performed during the six-month period following the Effective Date. Accordingly, the prepaid expense of $197 related to this stock issuance will be amortized on a straight-line basis as stock compensation expense within general and administrative expenses over the six-month period as services are performed. During the three and six months ended June 30, 2019, $99 of stock-based compensation expense was recognized in the Statements of Comprehensive Loss, all of which related to G&A expense.