Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Schedule of Common Stock Reserved for Future Issuance (Parenthetical) (Details)

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Stockholders' Equity - Schedule of Common Stock Reserved for Future Issuance (Parenthetical) (Details) - Common Stock - shares
3 Months Ended 5 Months Ended 9 Months Ended 14 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2018
Sep. 30, 2018
Class Of Stock [Line Items]        
Stock repurchase, shares   135,000    
Share Repurchase Program August 2017        
Class Of Stock [Line Items]        
Stock repurchase, shares 42,995   193,523 328,523