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Loss Per Share - Anti-dilutive Securities (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Weighted-average securities not included in computation of diluted shares outstanding (in shares) 15,301 40,758 15,852 40,814
Shares issuable upon conversion of PDH Common Stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Weighted-average securities not included in computation of diluted shares outstanding (in shares) 6,021 8,014 6,759 8,033
Shares issuable upon conversion of Series A Preferred Stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Weighted-average securities not included in computation of diluted shares outstanding (in shares) 2,000 2,000 2,000 2,000
Shares issuable upon conversion of Series B Convertible Preferred Stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Weighted-average securities not included in computation of diluted shares outstanding (in shares) 0 22,108 0 22,108
Shares contingently issuable for the contingent consideration        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Weighted-average securities not included in computation of diluted shares outstanding (in shares) 6,321 8,490 6,231 8,599
Stock options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Weighted-average securities not included in computation of diluted shares outstanding (in shares) 83 0 66 0
RSUs        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Weighted-average securities not included in computation of diluted shares outstanding (in shares) 875 144 793 72
Shares issuable under the ESPP        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Weighted-average securities not included in computation of diluted shares outstanding (in shares) 1 2 3 2