Subsequent Events

12 Months Ended

Dec. 31, 2017

Subsequent Events [Abstract]

Subsequent Events

20. Subsequent Event

In February 2018, the Company entered into a Securities Purchase Agreement pursuant to which it sold 4.1 million shares of common stock, 3.0 million shares of Series A convertible preferred stock and warrants to purchase 1.4 million shares of common stock for total gross proceeds of $59.1 million. These warrants have an exercise price of $8.31 per share, became exercisable upon issuance at the closing and expire seven years from the date of issuance. The Company completed the closing of this equity financing on March 5, 2018.