Condensed Statements of Cash Flows (Parenthetical) - USD ($)
$ in Thousands
|9 Months Ended|
Sep. 30, 2018
Sep. 30, 2017
|Proceeds from issuance of common stock and warrants, offering cost||$ 0||$ 5,674|
The cash outflow for cost incurred directly with the issuance of an equity security.
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef