Stockholders' Equity - Warrants Outstanding To Purchase Shares (Details) |
12 Months Ended |
---|---|
Dec. 31, 2018
$ / shares
shares
| |
Class of Stock [Line Items] | |
Warrant Exercise Price (in dollars per share) | $ / shares | $ 6.00 |
Shares Subject to purchase at December 31, 2018 | shares | 2,340,828 |
Warrant 1 | |
Class of Stock [Line Items] | |
Warrant Exercise Price (in dollars per share) | $ / shares | $ 3.33 |
Expiration Date | Jun. 23, 2020 |
Shares Subject to purchase at December 31, 2018 | shares | 702,247 |
Warrant 2 | |
Class of Stock [Line Items] | |
Warrant Exercise Price (in dollars per share) | $ / shares | $ 9.00 |
Expiration Date | May 18, 2019 |
Shares Subject to purchase at December 31, 2018 | shares | 1,605,131 |
Warrant 3 | |
Class of Stock [Line Items] | |
Warrant Exercise Price (in dollars per share) | $ / shares | $ 10.00 |
Expiration Date | Nov. 21, 2019 |
Shares Subject to purchase at December 31, 2018 | shares | 33,450 |