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Debt - Senior Secured Debt (Details) - USD ($)	Feb. 09, 2017	May 23, 2013	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 28, 2017	May 03, 2016
Debt Instrument [Line Items]
Cash and cash equivalents			$ 36,739,000	$ 47,758,000	$ 14,467,000	$ 25,961,000
Restricted cash			$ 500,000
Senior Subordinated Notes
Debt Instrument [Line Items]
Debt interest rate, stated percentage		12.00%
CRG Term Loan
Debt Instrument [Line Items]
Cash and cash equivalents covenant held	$ 2,000,000.0
CRG Term Loan \| Term Loan \| Restructured debt
Debt Instrument [Line Items]
Debt interest rate, stated percentage								11.00%
CRG Term Loan
Debt Instrument [Line Items]
Total potential borrowings		$ 50,000,000
Debt instrument term		6 years
WCAS Capital Partners IV, L.P. \| Payment-in-kind (PIK) interest \| Restructured debt
Debt Instrument [Line Items]
Debt interest rate, stated percentage							10.00%