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Term Loans and Debt - Key Terms and Details of Term Loan Borrowings (Details) - USD ($) $ in Thousands	1 Months Ended			12 Months Ended
	May 31, 2018	Mar. 31, 2018	Sep. 30, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Proceeds from term loans				$ 0	$ 118,578	$ 30,000
Term Loan \| Line of Credit \| First WTI Facility due February 2022
Debt Instrument [Line Items]
Proceeds from term loans			$ 30,000
Contractual interest rate			11.50%
Effective interest rate			15.90%
Term Loan \| Line of Credit \| First WTI Facility due September 2022
Debt Instrument [Line Items]
Proceeds from term loans		$ 30,000
Contractual interest rate		11.80%
Effective interest rate		14.80%
Term Loan \| Line of Credit \| Second WTI Facility due November 2022
Debt Instrument [Line Items]
Proceeds from term loans	$ 15,000
Contractual interest rate	12.00%
Effective interest rate	14.70%