Quarterly report pursuant to Section 13 or 15(d)

Capital Stock - ATM Agreements - Additional Information (Details)

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Capital Stock - ATM Agreements - Additional Information (Details) - USD ($)
 1 Months Ended 6 Months Ended
Feb. 28, 2017
Jun. 30, 2017
Nov. 12, 2015
Common Stock [Member]      
Class Of Warrant Or Right [Line Items]      
Sale of shares 1,200,000    
2015 ATM Agreement [Member]      
Class Of Warrant Or Right [Line Items]      
Sales commission paid per transaction (in hundredths)   3.00%  
Maximum amount of shares can be issued     $ 75,000,000
Proceeds from issuance of common stock   $ 600,000  
Offering costs offset against proceeds upon sale of common stock   $ 200,000  
2015 ATM Agreement [Member] | Common Stock [Member]      
Class Of Warrant Or Right [Line Items]      
Sale of shares   110,252