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Convertible Preferred Stock and Stockholders' Equity - Summary of Option and Stock Appreciation Rights Activity (Details)
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Options/SARs, Outstanding, Beginning Balance | shares 413,301
Number of Options/SARs, Granted | shares 950,500
Number of Options/SARs, Exercised | shares (2,916)
Number of Options/SARs, Forfeited | shares (195,799)
Number of Options/SARs, Outstanding, Ending Balance | shares 1,165,086
Weighted Average Exercise Price per Share, Outstanding, Beginning Balance $ 9.04
Weighted Average Exercise Price per Share, Granted 0.76
Weighted Average Exercise Price per Share, Exercised 0.62
Weighted Average Exercise Price per Share, Forfeited 7.66
Weighted Average Exercise Price per Share, Outstanding, Ending Balance 2.54
Range One [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Price, Lower Limit 0.62
Range of Exercise Price, Upper Limit 54.90
Range Two [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 1.07
Range Three [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Price, Upper Limit 0.62
Range Four [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Price, Lower Limit 0.62
Range of Exercise Price, Upper Limit 54.90
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