Stockholders' Equity	3 Months Ended
Mar. 31, 2019
Equity [Abstract]
Stockholders' Equity	9. Stockholders’ Equity In order to fund future operations, including planned clinical trials, the Company filed a shelf registration statement on Form S-3 (File No. 333-230333), which the Securities and Exchange Commission, or SEC, declared effective on April 4, 2019. 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 this 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. 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.

Stockholders' Equity

3 Months Ended

Mar. 31, 2019

9. Stockholders’ Equity

In order to fund future operations, including planned clinical trials, the Company filed a shelf registration statement on Form S-3 (File No. 333-230333), which the Securities and Exchange Commission, or SEC, declared effective on April 4, 2019. 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 this 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.

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.