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Stockholders' Equity - At-the-Market Equity Offering Program (Details) - USD ($)
Apr. 11, 2018
May 10, 2018
At-the-Market Equity Offering Program    
Maximum offering from universal shelf registration $ 50,000  
Offering period P3Y  
Baird | ATM Program    
At-the-Market Equity Offering Program    
Authorized to issue common stock   $ 30,000