Annual report pursuant to Section 13 and 15(d)

Equity and Mezzanine Equity - Antidiluted Securities Excluded From Calculation of Earning Per Share (Details)

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Equity and Mezzanine Equity - Antidiluted Securities Excluded From Calculation of Earning Per Share (Details) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Common units outstanding (in shares) 13,870,680 11,226,868  
Series B Preferred Stock      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Preferred stock outstanding (in shares) 1,875,748 1,875,848 1,871,244
Potential dilutive shares (in shares) 1,172,343 1,172,405 1,169,528
Series D Preferred Stock      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Preferred stock outstanding (in shares) 3,600,636 2,237,000 2,237,000
Potential dilutive shares (in shares) 5,307,541 3,297,465 3,297,465
Warrants to purchase Common Stock      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential dilutive shares (in shares) 276,746 329,378 329,378
Common units      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Common units outstanding (in shares) 235,032 635,018 761,954
Potential dilutive shares (in shares) 235,032 635,018 506,911
Senior Convertible Notes      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Outstanding shares (in shares)     2,509
Potential dilutive shares (in shares)     2,509