Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Preferred Stock (Details)

v3.8.0.1
Stockholders' Equity - Preferred Stock (Details) - $ / shares
Dec. 31, 2017
Dec. 31, 2016
Equity [Abstract]    
Preferred stock, par value (in dollars per share) $ 0.001  
Undesignated preferred stock authorized (in shares) 50,000,000  
Preferred stock liquidation preference per share (in dollars per share) $ 0.001  
Preferred stock issued (in shares) 0 0
Preferred stock outstanding (in shares) 0 0