Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Details 5)

v3.8.0.1
Stockholders' Equity (Details 5)
 12 Months Ended
Dec. 31, 2017
$ / shares
shares
Class of Warrant or Right [Line Items]  
Exercise price (in dollars per share) | $ / shares $ 8.45
Shares Subject to purchase | shares 2,340,828
Warrant 1 [Member]  
Class of Warrant or Right [Line Items]  
Exercise price (in dollars per share) | $ / shares $ 7.12
Expiration Date May 18, 2018
Shares Subject to purchase | shares 702,247
Warrant 2 [Member]  
Class of Warrant or Right [Line Items]  
Exercise price (in dollars per share) | $ / shares $ 9.00
Expiration Date May 18, 2019
Shares Subject to purchase | shares 1,605,131
Warrant 3 [Member]  
Class of Warrant or Right [Line Items]  
Exercise price (in dollars per share) | $ / shares $ 10.00
Expiration Date Nov. 21, 2019
Shares Subject to purchase | shares 33,450