Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Warrants Outstanding To Purchase Shares (Details)

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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