11. Related Party Transactions  | 
6 Months Ended | 
|---|---|
Jun. 30, 2017  | |
| Related Party Transactions [Abstract] | |
| Related Party Transactions | 
 The Company has entered into various research, development, license and supply agreements with its controlling stockholder, Pharmsynthez (as well as SynBio, a wholly owned subsidiary of Pharmsynthez), and Serum Institute, each a related party whose relationship and ownership has not materially changed from that disclosed in the Company’s Annual Report on Form 10-K for the years ended December 31, 2016 filed with the SEC on March 31, 2017, as amended on May 1, 2017.  |