Related Party Transactions	12 Months Ended
Dec. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	11. Related Party Transactions Kenneth A. Clark, a director of the Company since November 2017, is a member of the law firm of Wilson Sonsini Goodrich and Rosati (“WSGR”), which is also serves as the outside corporate counsel to the Company. During the years ended December 31, 2018 and 2017, the Company incurred expenses reported in general and administrative expenses in the consolidated statement of operations for legal services rendered by WSGR totaling approximately $1.2 million and $0.7 million, respectively. During the year ended December 31, 2018, the Company capitalized approximately $0.1 million for legal expenses incurred in connection with the rights offering (Note 8). During December 2018, the Company completed a rights offering pursuant to which it sold an aggregate of 3,581,148 shares of its common stock, par value $0.001 per share, at a price per share of $12.57, for net proceeds of approximately $44.8 million. At the time of transaction, Robert W. Duggan, the Company’s Chairman of the Board of Directors and the beneficial owner of approximately 35% of the Company’s then outstanding common stock prior to the rights offering. After giving effect to the rights offering, Mr. Duggan was the beneficial owner or approximately 44% of the Company’s outstanding stock as of December 31, 2018. MDB Capital Group, LLC (“MDB”) provided investment banking, executive recruiting and intellectual property management services to the Company. The Company’s former Chairman of the Board, Robert Levande, was a Senior Managing Director of MDB throughout his tenure on the Company’s Board. During the year ended December 31, 2016, the Company incurred $0.1 million for services rendered by MDB with respect to intellectual property management. The Company did not incur any amounts for intellectual property management services by MDB during the years ended December 31, 2017 or 2018. In connection with the Company’s 2016 IPO (Note 8), the underwriting syndicate led by MDB received $1.8 million in underwriting discounts, $0.2 million in unaccountable expense reimbursements and warrants valued in the aggregate of $1.4 million.

11. Related Party Transactions

Kenneth A. Clark, a director of the Company since November 2017, is a member of the law firm of Wilson Sonsini Goodrich and Rosati (“WSGR”), which is also serves as the outside corporate counsel to the Company. During the years ended December 31, 2018 and 2017, the Company incurred expenses reported in general and administrative expenses in the consolidated statement of operations for legal services rendered by WSGR totaling approximately $1.2 million and $0.7 million, respectively. During the year ended December 31, 2018, the Company capitalized approximately $0.1 million for legal expenses incurred in connection with the rights offering (Note 8).

During December 2018, the Company completed a rights offering pursuant to which it sold an aggregate of 3,581,148 shares of its common stock, par value $0.001 per share, at a price per share of $12.57, for net proceeds of approximately $44.8 million. At the time of transaction, Robert W. Duggan, the Company’s Chairman of the Board of Directors and the beneficial owner of approximately 35% of the Company’s then outstanding common stock prior to the rights offering. After giving effect to the rights offering, Mr. Duggan was the beneficial owner or approximately 44% of the Company’s outstanding stock as of December 31, 2018.

MDB Capital Group, LLC (“MDB”) provided investment banking, executive recruiting and intellectual property management services to the Company. The Company’s former Chairman of the Board, Robert Levande, was a Senior Managing Director of MDB throughout his tenure on the Company’s Board. During the year ended December 31, 2016, the Company incurred $0.1 million for services rendered by MDB with respect to intellectual property management. The Company did not incur any amounts for intellectual property management services by MDB during the years ended December 31, 2017 or 2018.

In connection with the Company’s 2016 IPO (Note 8), the underwriting syndicate led by MDB received $1.8 million in underwriting discounts, $0.2 million in unaccountable expense reimbursements and warrants valued in the aggregate of $1.4 million.