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Convertible Preferred Stock and Stockholders' Equity - Summary of Option and Stock Appreciation Rights Activity (Details)
3 Months Ended
Mar. 31, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Options/SARs, Outstanding, Beginning Balance | shares 1,165,086
Number of Options/SARs, Granted | shares 982,000
Number of Options/SARs, Exercised | shares (9,625)
Number of Options/SARs, Forfeited | shares (5,948)
Number of Options/SARs, Outstanding, Ending Balance | shares 2,131,513
Weighted Average Exercise Price per Share, Outstanding, Beginning Balance $ 2.54
Weighted Average Exercise Price per Share, Granted 2.03
Weighted Average Exercise Price per Share, Exercised 0.74
Weighted Average Exercise Price per Share, Forfeited 1.59
Weighted Average Exercise Price per Share, Outstanding, Ending Balance 2.32
Range One [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Price, Lower Limit 0.74
Range of Exercise Price, Upper Limit 43.90
Range Two [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Price, Upper Limit 2.03
Range Three [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Price, Lower Limit 0.74
Range of Exercise Price, Upper Limit 0.83
Range Four [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Price, Lower Limit 0.74
Range of Exercise Price, Upper Limit 4.04
Range Five [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Price, Lower Limit 0.74
Range of Exercise Price, Upper Limit $ 43.90