Condensed Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands |
6 Months Ended | |
|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
|
| Proceeds from issuance of common stock and warrants, offering cost | $ 0 | $ 5,671 |
| X | ||||||||||
- Definition The cash outflow for cost incurred directly with the issuance of an equity security. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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