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Stock-Based Compensation (Details) - shares
1 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Mar. 31, 2017
Stock Option Plans        
Company’s common stock available for issuance (in shares)   9,028,652 7,927,394  
Employee Stock Purchase Plan        
Stock Option Plans        
Increase in common stock available for issuance (in shares)   220,090    
Employee Stock Purchase Plan | Maximum        
Stock Option Plans        
Increase in common stock reserved for issuance as a percentage of total number of shares of the Company's capital stock outstanding on the last day of the preceding fiscal year   1.00%    
2014 Equity Incentive Plan        
Stock Option Plans        
Increase in common stock reserved for issuance as a percentage of total number of shares of the Company's capital stock outstanding on the last day of the preceding fiscal year 4.00%      
Increase in common stock available for issuance (in shares)     880,362  
2016 Inducement Plan        
Stock Option Plans        
Company’s common stock available for issuance (in shares) 900,000     450,000
Company’s additional common stock available for issuance (in shares) 450,000